Optical imaging system, image capturing unit and electronic device

ABSTRACT

An optical imaging system includes seven lens elements which are, in order from an object side to an image side along an optical path: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. Each of the seven lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side. The seventh lens element has negative refractive power, and the object-side surface of the seventh lens element is concave in a paraxial region thereof. At least one of the object-side surface and the image-side surface of at least one lens element of the optical imaging system has at least one inflection point in an off-axis region thereof.

RELATED APPLICATIONS

This application claims priority to Taiwan Application 110144740, filedon Dec. 1, 2021, which is incorporated by reference herein in itsentirety.

BACKGROUND Technical Field

The present disclosure relates to an optical imaging system, an imagecapturing unit and an electronic device, more particularly to an opticalimaging system and an image capturing unit applicable to an electronicdevice.

Description of Related Art

With the development of semiconductor manufacturing technology, theperformance of image sensors has improved, and the pixel size thereofhas been scaled down. Therefore, featuring high image quality becomesone of the indispensable features of an optical system nowadays.

Furthermore, due to the rapid changes in technology, electronic devicesequipped with optical systems are trending towards multi-functionalityfor various applications, and therefore the functionality requirementsfor the optical systems have been increasing. However, it is difficultfor a conventional optical system to obtain a balance among therequirements such as high image quality, low sensitivity, a properaperture size, miniaturization and a desirable field of view.

SUMMARY

According to one aspect of the present disclosure, an optical imagingsystem includes seven lens elements. The seven lens elements are, inorder from an object side to an image side along an optical path, afirst lens element, a second lens element, a third lens element, afourth lens element, a fifth lens element, a sixth lens element and aseventh lens element. Each of the seven lens elements has an object-sidesurface facing toward the object side and an image-side surface facingtoward the image side.

The image-side surface of the sixth lens element is concave in aparaxial region thereof. The seventh lens element has negativerefractive power, and the object-side surface of the seventh lenselement is concave in a paraxial region thereof. At least one of theobject-side surface and the image-side surface of at least one lenselement of the optical imaging system has at least one inflection pointin an off-axis region thereof.

When a maximum image height of the optical imaging system is ImgH, anaxial distance between the image-side surface of the seventh lenselement and an image surface is BL, a focal length of the opticalimaging system is f, a curvature radius of the object-side surface ofthe seventh lens element is R13, and a curvature radius of theimage-side surface of the seventh lens element is R14, the followingconditions are satisfied:

7.50<ImgH/BL; and

−5.0<f/R13+f/R14<−2.8.

According to another aspect of the present disclosure, an opticalimaging system includes seven lens elements. The seven lens elementsare, in order from an object side to an image side along an opticalpath, a first lens element, a second lens element, a third lens element,a fourth lens element, a fifth lens element, a sixth lens element and aseventh lens element. Each of the seven lens elements has an object-sidesurface facing toward the object side and an image-side surface facingtoward the image side.

The image-side surface of the first lens element is concave in aparaxial region thereof. The image-side surface of the sixth lenselement is concave in a paraxial region thereof. The seventh lenselement has negative refractive power, the object-side surface of theseventh lens element is concave in a paraxial region thereof, and theimage-side surface of the seventh lens element is convex in a paraxialregion thereof. At least one of the object-side surface and theimage-side surface of at least one lens element of the optical imagingsystem has at least one inflection point in an off-axis region thereof.

When a maximum image height of the optical imaging system is ImgH, anaxial distance between the image-side surface of the seventh lenselement and an image surface is BL, a curvature radius of the image-sidesurface of the seventh lens element is R14, and a focal length of theoptical imaging system is f, the following conditions are satisfied:

7.50<ImgH/BL; and

−10<R14/f<−0.70.

According to another aspect of the present disclosure, an opticalimaging system includes seven lens elements. The seven lens elementsare, in order from an object side to an image side along an opticalpath, a first lens element, a second lens element, a third lens element,a fourth lens element, a fifth lens element, a sixth lens element and aseventh lens element. Each of the seven lens elements has an object-sidesurface facing toward the object side and an image-side surface facingtoward the image side.

The image-side surface of the first lens element is concave in aparaxial region thereof. The object-side surface of the sixth lenselement is convex in a paraxial region thereof. The seventh lens elementhas negative refractive power, the object-side surface of the seventhlens element is concave in a paraxial region thereof, and the image-sidesurface of the seventh lens element is convex in a paraxial regionthereof. At least one of the object-side surface and the image-sidesurface of at least one lens element of the optical imaging system hasat least one inflection point in an off-axis region thereof.

When a maximum image height of the optical imaging system is ImgH, anaxial distance between the image-side surface of the seventh lenselement and an image surface is BL, a curvature radius of the image-sidesurface of the seventh lens element is R14, and a focal length of theseventh lens element is f7, the following conditions are satisfied:

7.50<ImgH/BL; and

0.75<R14/f7<9.5.

According to another aspect of the present disclosure, an imagecapturing unit includes one of the aforementioned optical imagingsystems and an image sensor, wherein the image sensor is disposed on theimage surface of the optical imaging system.

According to another aspect of the present disclosure, an electronicdevice includes the aforementioned image capturing unit.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure can be better understood by reading the followingdetailed description of the embodiments, with reference made to theaccompanying drawings as follows:

FIG. 1 is a schematic view of an image capturing unit according to the1st embodiment of the present disclosure;

FIG. 2 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 1stembodiment;

FIG. 3 is a schematic view of an image capturing unit according to the2nd embodiment of the present disclosure;

FIG. 4 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 2ndembodiment;

FIG. 5 is a schematic view of an image capturing unit according to the3rd embodiment of the present disclosure;

FIG. 6 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 3rdembodiment;

FIG. 7 is a schematic view of an image capturing unit according to the4th embodiment of the present disclosure;

FIG. 8 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 4thembodiment;

FIG. 9 is a schematic view of an image capturing unit according to the5th embodiment of the present disclosure;

FIG. 10 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 5thembodiment;

FIG. 11 is a schematic view of an image capturing unit according to the6th embodiment of the present disclosure;

FIG. 12 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 6thembodiment;

FIG. 13 is a schematic view of an image capturing unit according to the7th embodiment of the present disclosure;

FIG. 14 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 7thembodiment;

FIG. 15 is a schematic view of an image capturing unit according to the8th embodiment of the present disclosure;

FIG. 16 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 8thembodiment;

FIG. 17 is a schematic view of an image capturing unit according to the9th embodiment of the present disclosure;

FIG. 18 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 9thembodiment;

FIG. 19 is a schematic view of an image capturing unit according to the10th embodiment of the present disclosure;

FIG. 20 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 10thembodiment;

FIG. 21 is a perspective view of an image capturing unit according tothe 11th embodiment of the present disclosure;

FIG. 22 is one perspective view of an electronic device according to the12th embodiment of the present disclosure;

FIG. 23 is another perspective view of the electronic device in FIG. 22;

FIG. 24 is a block diagram of the electronic device in FIG. 22 ;

FIG. 25 is one perspective view of an electronic device according to the13th embodiment of the present disclosure;

FIG. 26 is one perspective view of an electronic device according to the14th embodiment of the present disclosure;

FIG. 27 shows a schematic view of Y11, Y42, Y61, Yc61, Y62, Yc62, Y71,Yc71, Y72, Ang72c, Ang72s, ImgH, inflection points of the lens elementsand some critical points of the sixth lens element and the seventh lenselement according to the 1st embodiment of the present disclosure;

FIG. 28 shows a schematic view of a configuration of a light-foldingelement in an optical imaging system according to one embodiment of thepresent disclosure;

FIG. 29 shows a schematic view of another configuration of alight-folding element in an optical imaging system according to oneembodiment of the present disclosure; and

FIG. 30 shows a schematic view of a configuration of two light-foldingelements in an optical imaging system according to one embodiment of thepresent disclosure.

DETAILED DESCRIPTION

An optical imaging system includes seven lens elements. The seven lenselements are, in order from an object side to an image side along anoptical path, a first lens element, a second lens element, a third lenselement, a fourth lens element, a fifth lens element, a sixth lenselement and a seventh lens element. Each of the seven lens elements ofthe optical imaging system has an object-side surface facing toward theobject side and an image-side surface facing toward the image side.

The first lens element can have positive refractive power. Therefore, itis favorable for reducing the size of the object side of the opticalimaging system. The object-side surface of the first lens element can beconvex in a paraxial region thereof. Therefore, it is favorable foradjusting the light incident direction so as to enlarge the field ofview. The image-side surface of the first lens element can be concave ina paraxial region thereof. Therefore, it is favorable for adjusting thesurface shape of the first lens element so as to correct aberrationssuch as astigmatism.

The image-side surface of the second lens element can be concave in aparaxial region thereof. Therefore, it is favorable for adjusting lighttraveling direction so as to reduce the outer diameter of the objectside of the optical imaging system.

The sixth lens element can have positive refractive power. Therefore, itis favorable for reducing the size of the image side of the opticalimaging system. The object-side surface of the sixth lens element can beconvex in a paraxial region thereof. Therefore, it is favorable foradjusting the surface shape and refractive power of the sixth lenselement so as to reduce the size and correct aberrations. Theobject-side surface of the sixth lens element can have at least oneconcave critical point in an off-axis region thereof. Therefore, it isfavorable for adjusting the surface shape of the sixth lens element soas to reduce surface reflection and correct off-axis aberrations.Moreover, when a vertical distance between a concave critical point onthe object-side surface of the sixth lens element and an optical axis isYc61, and a maximum effective radius of the object-side surface of thesixth lens element is Y61, the object-side surface of the sixth lenselement can have at least one concave critical point in an off-axisregion thereof satisfying the following condition: 0.20<Yc61/Y61<0.55.Therefore, it is favorable for adjusting the surface shape of the sixthlens element so as to improve image quality. The image-side surface ofthe sixth lens element can be concave in a paraxial region thereof.Therefore, it is favorable for adjusting the surface shape andrefractive power of the sixth lens element so as to correct aberrations.The image-side surface of the sixth lens element can have at least oneconvex critical point in an off-axis region thereof. Therefore, it isfavorable for adjusting the surface shape of the sixth lens element soas to correct off-axis aberrations such as field curvature. Moreover,when a vertical distance between a convex critical point on theimage-side surface of the sixth lens element and the optical axis isYc62, and a maximum effective radius of the image-side surface of thesixth lens element is Y62, the image-side surface of the sixth lenselement can have at least one convex critical point in an off-axisregion thereof satisfying the following condition: 0.20<Yc62/Y62<0.50.Therefore, it is favorable for adjusting the surface shape of the sixthlens element so as to correct aberrations. Please refer to FIG. 27 ,which shows a schematic view of Y61, Yc61, Y62, Yc62 and the non-axialcritical points C of the sixth lens element E6 according to the 1stembodiment of the present disclosure.

The seventh lens element has negative refractive power. Therefore, it isfavorable for adjusting the back focal length. The object-side surfaceof the seventh lens element is concave in a paraxial region thereof.Therefore, it is favorable for adjusting the surface shape andrefractive power of the seventh lens element so as to improve the imagequality of wide field of view and enlarge the image surface. Theobject-side surface of the seventh lens element can have at least oneconvex critical point in an off-axis region thereof. Therefore, it isfavorable for adjusting the surface shape of the seventh lens element soas to improve the image quality for wide field of view. Moreover, when avertical distance between a convex critical point on the object-sidesurface of the seventh lens element and the optical axis is Yc71, and amaximum effective radius of the object-side surface of the seventh lenselement is Y71, the object-side surface of the seventh lens element canhave at least one convex critical point in an off-axis region thereofsatisfying the following condition: 0.80<Yc71/Y71<0.97. Therefore, it isfavorable for adjusting the surface shape of the seventh lens element soas to improve the image quality. The image-side surface of the seventhlens element can be convex in a paraxial region thereof. Therefore, itis favorable for adjusting the angle of light incident on the imagesurface so as to enlarge the image surface. Please refer to FIG. 27 ,which shows a schematic view of Y71, Yc71, and the non-axial convexcritical point C of the object-side surface of the seventh lens elementE7 according to the 1st embodiment of the present disclosure. Some ofthe non-axial critical points C of the object-side surface of the sixthlens element E6, the image-side surface of the sixth lens element E6 andthe object-side surface of the seventh lens element E7 in FIG. 27 areonly exemplary. Each of the lens elements in various embodiments of thepresent disclosure can have one or more non-axial critical points.

According to the present disclosure, at least one of the object-sidesurface and the image-side surface of at least one lens element of theoptical imaging system can have at least one inflection point in anoff-axis region thereof. Therefore, it is favorable for increasing theshape variation of the lens elements so as to correct aberrations andreduce the size of the lens elements. Moreover, at least one of theobject-side surface and the image-side surface of each of at least twolens elements of the optical imaging system can have at least oneinflection point in an off-axis region thereof. Moreover, at least oneof the object-side surface and the image-side surface of each of atleast three lens elements of the optical imaging system can have atleast one inflection point in an off-axis region thereof. Please referto FIG. 27 , which shows a schematic view of the non-axial inflectionpoints P of the lens elements according to the 1st embodiment of thepresent disclosure.

When a maximum image height of the optical imaging system (which can behalf of a diagonal length of an effective photosensitive area of animage sensor) is ImgH, and an axial distance between the image-sidesurface of the seventh lens element and the image surface is BL, thefollowing condition is satisfied: 7.50<ImgH/BL. Therefore, it isfavorable for enlarging the image surface and reducing the back focallength so as to reduce the total track length. Moreover, the followingcondition can also be satisfied: 8.50<ImgH/BL. Moreover, the followingcondition can also be satisfied: 9.50<ImgH/BL. Moreover, the followingcondition can also be satisfied: ImgH/BL<50.0. Therefore, it isfavorable for preventing an imbalance between the image height and theback focal length, thereby ensuring the image quality. Moreover, thefollowing condition can also be satisfied: ImgH/BL<40.0. Moreover, thefollowing condition can also be satisfied: ImgH/BL<30.0. Please refer toFIG. 27 , which shows a schematic view of ImgH according to the 1stembodiment of the present disclosure.

When a focal length of the optical imaging system is f, a curvatureradius of the object-side surface of the seventh lens element is R13,and a curvature radius of the image-side surface of the seventh lenselement is R14, the following condition can be satisfied:−5.0<f/R13+f/R14<−2.8. Therefore, it is favorable for adjusting thesurface shape and refractive power of the seventh lens element so as toenlarge the field of view and the image height. Moreover, the followingcondition can also be satisfied: −4.5<f/R13+f/R14<−3.0.

When the curvature radius of the image-side surface of the seventh lenselement is R14, and the focal length of the optical imaging system is f,the following condition can be satisfied: −10<R14/f<−0.70. Therefore, itis favorable for adjusting the surface shape and refractive power of theseventh lens element so as to enlarge the field of view and the imageheight. Moreover, the following condition can also be satisfied:−7.5<R14/f<−0.90. Moreover, the following condition can also besatisfied: −5.5<R14/f<−1.1.

When the curvature radius of the image-side surface of the seventh lenselement is R14, and a focal length of the seventh lens element is f7,the following condition can be satisfied: 0.75<R14/f7<9.5. Therefore, itis favorable for adjusting the surface shape and refractive power of theseventh lens element so as to enlarge the field of view and the imageheight. Moreover, the following condition can also be satisfied:1.0<R14/f7<8.5. Moreover, the following condition can also be satisfied:1.3<R14/f7<7.5. Moreover, the following condition can also be satisfied:1.5<R14/f7<6.5.

When an Abbe number of the first lens element is V1, an Abbe number ofthe second lens element is V2, an Abbe number of the third lens elementis V3, an Abbe number of the fourth lens element is V4, and an Abbenumber of the fifth lens element is V5, the following condition can besatisfied: 1.4<(V1+V3)/(V2+V4+V5)<4.0. Therefore, it is favorable foradjusting the material distribution of the lens elements so as tocorrect aberrations. Moreover, the following condition can also besatisfied: 1.8<(V1+V3)/(V2+V4+V5)<3.0.

When an axial distance between the sixth lens element and the seventhlens element is T67, and the axial distance between the image-sidesurface of the seventh lens element and the image surface is BL, thefollowing condition can be satisfied: 1.9<T67/BL. Therefore, it isfavorable for adjusting the distribution of the lens elements so as toenlarge the image surface and reduce the back focal length. Moreover,the following condition can also be satisfied: 2.2<T67/BL. Moreover, thefollowing condition can also be satisfied: 2.5<T67/BL. Moreover, thefollowing condition can also be satisfied: T67/BL<20. Therefore, it isfavorable for adjusting the position of the seventh lens element so asto reduce the total track length and improve the image quality.Moreover, the following condition can also be satisfied: T67/BL<15.Moreover, the following condition can also be satisfied: T67/BL<10.

When a curvature radius of the image-side surface of the sixth lenselement is R12, and the curvature radius of the object-side surface ofthe seventh lens element is R13, the following condition can besatisfied: 1.5<(R12−R13)/(R12+R13)<3.0. Therefore, it is favorable forthe sixth lens element and the seventh lens element to collaborate witheach other so as to correct aberrations. Moreover, the followingcondition can also be satisfied: 1.8<(R12−R13)/(R12+R13)<2.5.

When an angle between the optical axis and a chief ray at a maximumfield of view emerging from the image-side surface of the seventh lenselement is Ang72c, the following condition can be satisfied: 40.0degrees<|Ang72c|<55.0 degrees. Therefore, it is favorable for adjustingthe angle of emergence on the seventh lens element so as to enlarge theimage surface. Please refer to FIG. 27 , which shows a schematic view ofAng72c according to the 1st embodiment of the present disclosure. Asseen, the angle between the optical axis and an extended reference lineRL representing a chief ray CR at a maximum field of view of incidenceemergent from the image-side surface of the seventh lens element E7 canbe viewed as Ang72c.

When a maximum effective radius of the object-side surface of the firstlens element is Y11, and a maximum effective radius of the image-sidesurface of the fourth lens element is Y42, the following condition canbe satisfied: 0.65<Y11/Y42<1.5. Therefore, it is favorable for adjustingthe light traveling direction so as to reduce the outer diameter of theobject side of the optical imaging system. Please refer to FIG. 27 ,which shows a schematic view of Y11 and Y42 according to the 1stembodiment of the present disclosure.

When the maximum effective radius of the object-side surface of thefirst lens element is Y11, and a maximum effective radius of theimage-side surface of the seventh lens element is Y72, the followingcondition can be satisfied: 2.0<Y72/Y11<5.0. Therefore, it is favorablefor adjusting the size distribution of the optical imaging system andenlarging the field of view and the image surface. Please refer to FIG.27 , which shows a schematic view of Y11 and Y72 according to the 1stembodiment of the present disclosure.

When a focal length of the sixth lens element is f6, a curvature radiusof the object-side surface of the sixth lens element is R11, and thecurvature radius of the image-side surface of the sixth lens element isR12, the following condition can be satisfied: 3.0<|f6|/R11+|f6|/R12.Therefore, it is favorable for adjusting the surface shape andrefractive power of the sixth lens element so as to correct aberrations.Moreover, the following condition can also be satisfied:3.5<|f6|/R11+|f6|/R12<15. Moreover, the following condition can also besatisfied: 4.0<|f6|/R11+|f6|/R12<9.0.

When the focal length of the optical imaging system is f, a focal lengthof the second lens element is f2, a focal length of the third lenselement is f3, a focal length of the fourth lens element is f4, and afocal length of the fifth lens element is f5, the following conditioncan be satisfied: |f/f2|+|f/f3|+|f/f4|+|f/f5|<1.8. Therefore, it isfavorable for the refractive power of the lens elements to collaboratewith one another so as to balance the refractive power distribution ofthe optical imaging system. Moreover, the following condition can alsobe satisfied: |f/f2|+|f/f3|+|f/f4|+|f/f5|<1.5.

When the Abbe number of the first lens element is V1, the Abbe number ofthe second lens element is V2, and the Abbe number of the third lenselement is V3, the following condition can be satisfied:5.0<(V1+V3)/V2<12. Therefore, it is favorable for selecting materials ofthe lens elements at the object side of the optical imaging system tocollaborate with one another so as to correct chromatic aberration.Moreover, the following condition can also be satisfied:6.0<(V1+V3)/V2<9.0.

When a central thickness of the third lens element is CT3, and an axialdistance between the second lens element and the third lens element isT23, the following condition can be satisfied: 1.0<CT3/T23<2.7.Therefore, it is favorable for the second lens element and third lenselement to collaborate with each other so as to reduce the size of theobject side of the optical imaging system.

According to the present disclosure, the optical imaging system canfurther include one or more light permeable elements disposed betweenthe seventh lens element and the image surface. When the maximum imageheight of the optical imaging system is ImgH, a maximum value amongrefractive indices of all light permeable elements in an opticallyeffective area is NEmax, and the axial distance between the image-sidesurface of the seventh lens element and the image surface is BL, thefollowing condition can be satisfied: 14.0<ImgH×NEmax/BL. Therefore, itis favorable for enlarging the image surface and reducing the back focallength. Moreover, the following condition can also be satisfied:15.5<ImgH×NEmax/BL. Moreover, the following condition can also besatisfied: 17.0<ImgH×NEmax/BL. Moreover, the following condition canalso be satisfied: ImgH×NEmax/BL<80.0. Therefore, it is favorable foradjusting the arrangement between the lens elements and the imagesurface so as to increase assembling yield rate. Moreover, the followingcondition can also be satisfied: ImgH×NEmax/BL<65.0. Moreover, thefollowing condition can also be satisfied: ImgH×NEmax/BL<50.0. In aconfiguration where the optical imaging system includes a single lightpermeable element disposed between the seventh lens element and theimage surface, NEmax is equal to the refractive index of the lightpermeable element. In a configuration where the optical imaging systemincludes a plurality of light permeable elements disposed between theseventh lens element and the image surface, NEmax is equal to themaximum value among refractive indices of these light permeableelements.

When the focal length of the optical imaging system is f, and acurvature radius of the image-side surface of the second lens element isR4, the following condition can be satisfied: 0.20<f/R4<1.4. Therefore,it is favorable for adjusting the surface shape and refractive power ofthe second lens element so as to correct aberrations, such asastigmatism.

When a focal length of the first lens element is f1, and a centralthickness of the first lens element is CT1, the following condition canbe satisfied: 6.5<f1/CT1<15. Therefore, it is favorable for adjustingthe surface shape and refractive power of the first lens element so asto reduce the size. Moreover, the following condition can also besatisfied: 7.0<f1/CT1<13.

When an f-number of the optical imaging system is Fno, the followingcondition can be satisfied: 1.2<Fno<2.0. Therefore, it is favorable forobtaining a balance between the illuminance and depth of field.

When half of a maximum field of view of the optical imaging system isHFOV, the following condition can be satisfied: 35.0 degrees<HFOV<65.0degrees. Therefore, it is favorable for obtaining a wide angleconfiguration and preventing aberrations, such as distortion, caused byoverly large field of view. Moreover, the following condition can alsobe satisfied: 42.0 degrees<HFOV<55.0 degrees.

When an angle between a plane perpendicular to the optical axis and atangent plane to the image-side surface of the seventh lens element at aperiphery of an optically effective area is Ang72s, the followingcondition can be satisfied: |Ang72s|<20.0 degrees. Therefore, it isfavorable for adjusting the surface shape of the seventh lens element soas to improve lens molding yield rate. Please refer to FIG. 27 , whichshows a schematic view of Ang72s according to the 1st embodiment of thepresent disclosure, wherein an angle between a plane RP perpendicular tothe optical axis and a tangent plane TP to the image-side surface of theseventh lens element E7 at the periphery of the optically effective areais Ang72s.

When a central thickness of the fifth lens element is CT5, a centralthickness of the sixth lens element is CT6, and an axial distancebetween the fifth lens element and the sixth lens element is T56, thefollowing condition can be satisfied: 0.75<(CT5+CT6)/T56<2.4. Therefore,it is favorable for the fifth lens element and the sixth lens element tocollaborate with each other so as to correct aberrations. Moreover, thefollowing condition can also be satisfied: 1.0<(CT5+CT6)/T56≤2.01.

When an axial distance between the object-side surface of the first lenselement and the image-side surface of the seventh lens element is TD,and the axial distance between the image-side surface of the seventhlens element and the image surface is BL, the following condition can besatisfied: 9.5<TD/BL. Therefore, it is favorable for adjusting thedistribution of the lens elements and the back focal length so as toreduce the back focal length. Moreover, the following condition can alsobe satisfied: TD/BL<30. Therefore, it is favorable for adjusting thedistribution of the lens elements and the back focal length so as toreduce the total track length.

When an axial distance between the object-side surface of the first lenselement and the image surface is TL, and the maximum image height of theoptical imaging system is ImgH, the following condition can besatisfied: 0.40<TL/ImgH<1.6. Therefore, it is favorable for obtaining abalance between reducing the total track length and enlarging the imagesurface. Moreover, the following condition can also be satisfied:0.60<TL/ImgH<1.4. Moreover, the following condition can also besatisfied: 0.80<TL/ImgH<1.2.

When the focal length of the optical imaging system is f, and acomposite focal length of the second lens element, the third lenselement and the fourth lens element is f234, the following condition canbe satisfied: 4.5<|f234/f|. Therefore, it is favorable for adjusting therefractive power of the lens elements so as to balance the refractivepower distribution at the object side of the optical imaging system.Moreover, the following condition can also be satisfied: 5.5<|f234/f|.

When a curvature radius of the object-side surface of the first lenselement is R1, and a curvature radius of the image-side surface of thefirst lens element is R2, the following condition can be satisfied:−4.0<(R1+R2)/(R1−R2)<−1.0. Therefore, it is favorable for adjusting thesurface shape of the first lens element so as to reduce the size andcorrect aberrations. Moreover, the following condition can also besatisfied: −3.6<(R1+R2)/(R1−R2)<−1.4.

According to the present disclosure, the aforementioned features andconditions can be utilized in numerous combinations so as to achievecorresponding effects.

According to the present disclosure, the lens elements of the opticalimaging system can be made of either glass or plastic material. When thelens elements are made of glass material, the refractive powerdistribution of the optical imaging system may be more flexible, and theinfluence on imaging caused by external environment temperature changemay be reduced. The glass lens element can either be made by grinding ormolding. When the lens elements are made of plastic material, themanufacturing costs can be effectively reduced. Furthermore, surfaces ofeach lens element can be arranged to be spherical or aspheric. Sphericallens elements are simple in manufacture. Aspheric lens element designallows more control variables for eliminating aberrations thereof andreducing the required number of lens elements, and the total tracklength of the optical imaging system can therefore be effectivelyshortened. Additionally, the aspheric surfaces may be formed by plasticinjection molding or glass molding.

According to the present disclosure, when a lens surface is aspheric, itmeans that the lens surface has an aspheric shape throughout itsoptically effective area, or a portion(s) thereof.

According to the present disclosure, one or more of the lens elements'material may optionally include an additive which alters the lenselements' transmittance in a specific range of wavelength for areduction in unwanted stray light or color deviation. For example, theadditive may optionally filter out light in the wavelength range of 600nm to 800 nm to reduce excessive red light and/or near infrared light;or may optionally filter out light in the wavelength range of 350 nm to450 nm to reduce excessive blue light and/or near ultraviolet light frominterfering the final image. The additive may be homogeneously mixedwith a plastic material to be used in manufacturing a mixed-materiallens element by injection molding. Moreover, the additive may be coatedon the lens surfaces to provide the abovementioned effects.

According to the present disclosure, each of an object-side surface andan image-side surface has a paraxial region and an off-axis region. Theparaxial region refers to the region of the surface where light raystravel close to the optical axis, and the off-axis region refers to theregion of the surface away from the paraxial region. Particularly,unless otherwise stated, when the lens element has a convex surface, itindicates that the surface is convex in the paraxial region thereof;when the lens element has a concave surface, it indicates that thesurface is concave in the paraxial region thereof. Moreover, when aregion of refractive power or focus of a lens element is not defined, itindicates that the region of refractive power or focus of the lenselement is in the paraxial region thereof.

According to the present disclosure, an inflection point is a point onthe surface of the lens element at which the surface changes fromconcave to convex, or vice versa. A critical point is a non-axial pointof the lens surface where its tangent is perpendicular to the opticalaxis.

According to the present disclosure, the image surface of the opticalimaging system, based on the corresponding image sensor, can be flat orcurved, especially a curved surface being concave facing towards theobject side of the optical imaging system.

According to the present disclosure, an image correction unit, such as afield flattener, can be optionally disposed between the lens elementclosest to the image side of the optical imaging system along theoptical path and the image surface for correction of aberrations such asfield curvature. The optical properties of the image correction unit,such as curvature, thickness, index of refraction, position and surfaceshape (convex or concave surface with spherical, aspheric, diffractiveor Fresnel types), can be adjusted according to the design of the imagecapturing unit. In general, a preferable image correction unit is, forexample, a thin transparent element having a concave object-side surfaceand a planar image-side surface, and the thin transparent element isdisposed near the image surface.

According to the present disclosure, at least one light-folding element,such as a prism or a mirror, can be optionally disposed between animaged object and the image surface on the imaging optical path, suchthat the optical imaging system can be more flexible in spacearrangement, and therefore the dimensions of an electronic device is notrestricted by the total track length of the optical imaging system.Specifically, please refer to FIG. 28 and FIG. 29 . FIG. 28 shows aschematic view of a configuration of a light-folding element in anoptical imaging system according to one embodiment of the presentdisclosure, and FIG. 29 shows a schematic view of another configurationof a light-folding element in an optical imaging system according to oneembodiment of the present disclosure. In FIG. 28 and FIG. 29 , theoptical imaging system can have, in order from an imaged object (notshown in the figures) to an image surface IMG along an optical path, afirst optical axis OA1, a light-folding element LF and a second opticalaxis OA2. The light-folding element LF can be disposed between theimaged object and a lens group LG of the optical imaging system as shownin FIG. 28 or disposed between a lens group LG of the optical imagingsystem and the image surface IMG as shown in FIG. 29 . Furthermore,please refer to FIG. 30 , which shows a schematic view of aconfiguration of two light-folding elements in an optical imaging systemaccording to one embodiment of the present disclosure. In FIG. 30 , theoptical imaging system can have, in order from an imaged object (notshown in the figure) to an image surface IMG along an optical path, afirst optical axis OA1, a first light-folding element LF1, a secondoptical axis OA2, a second light-folding element LF2 and a third opticalaxis OA3. The first light-folding element LF1 is disposed between theimaged object and a lens group LG of the optical imaging system, thesecond light-folding element LF2 is disposed between the lens group LGof the optical imaging system and the image surface IMG, and thetravelling direction of light on the first optical axis OA1 can be thesame direction as the travelling direction of light on the third opticalaxis OA3 as shown in FIG. 30 . The optical imaging system can beoptionally provided with three or more light-folding elements, and thepresent disclosure is not limited to the type, amount and position ofthe light-folding elements of the embodiments disclosed in theaforementioned figures.

According to the present disclosure, the optical imaging system caninclude at least one stop, such as an aperture stop, a glare stop or afield stop. Said glare stop or said field stop is set for eliminatingthe stray light and thereby improving image quality thereof.

According to the present disclosure, an aperture stop can be configuredas a front stop or a middle stop. A front stop disposed between animaged object and the first lens element can provide a longer distancebetween an exit pupil of the optical imaging system and the imagesurface to produce a telecentric effect, and thereby improves theimage-sensing efficiency of an image sensor (for example, CCD or CMOS).A middle stop disposed between the first lens element and the imagesurface is favorable for enlarging the viewing angle of the opticalimaging system and thereby provides a wider field of view for the same.

According to the present disclosure, the optical imaging system caninclude an aperture control unit. The aperture control unit may be amechanical component or a light modulator, which can control the sizeand shape of the aperture through electricity or electrical signals. Themechanical component can include a movable member, such as a bladeassembly or a light shielding sheet. The light modulator can include ashielding element, such as a filter, an electrochromic material or aliquid-crystal layer. The aperture control unit controls the amount ofincident light or exposure time to enhance the capability of imagequality adjustment. In addition, the aperture control unit can be theaperture stop of the present disclosure, which changes the f-number toobtain different image effects, such as the depth of field or lensspeed.

According to the above description of the present disclosure, thefollowing specific embodiments are provided for further explanation.

1st Embodiment

FIG. 1 is a schematic view of an image capturing unit according to the1st embodiment of the present disclosure. FIG. 2 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 1stembodiment. In FIG. 1 , the image capturing unit 1 includes the opticalimaging system (its reference numeral is omitted) of the presentdisclosure and an image sensor IS. The optical imaging system includes,in order from an object side to an image side along an optical axis, anaperture stop ST, a first lens element E1, a second lens element E2, astop S1, a third lens element E3, a stop S2, a fourth lens element E4, afifth lens element E5, a sixth lens element E6, a seventh lens elementE7, a filter E8 and an image surface IMG. The optical imaging systemincludes seven lens elements (E1, E2, E3, E4, E5, E6 and E7) with noadditional lens element disposed between each of the adjacent seven lenselements.

The first lens element E1 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The firstlens element E1 is made of glass material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the first lens element E1 has one inflection point in anoff-axis region thereof. The image-side surface of the first lenselement E1 has one inflection point in an off-axis region thereof.

The second lens element E2 with negative refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. Thesecond lens element E2 is made of plastic material and has theobject-side surface and the image-side surface being both aspheric. Theobject-side surface of the second lens element E2 has two inflectionpoints in an off-axis region thereof.

The third lens element E3 with positive refractive power has anobject-side surface being concave in a paraxial region thereof and animage-side surface being convex in a paraxial region thereof. The thirdlens element E3 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the third lens element E3 has two inflection points in anoff-axis region thereof.

The fourth lens element E4 with negative refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. Thefourth lens element E4 is made of plastic material and has theobject-side surface and the image-side surface being both aspheric. Theobject-side surface of the fourth lens element E4 has three inflectionpoints in an off-axis region thereof. The image-side surface of thefourth lens element E4 has two inflection points in an off-axis regionthereof.

The fifth lens element E5 with negative refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The fifthlens element E5 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the fifth lens element E5 has two inflection points in anoff-axis region thereof. The image-side surface of the fifth lenselement E5 has three inflection points in an off-axis region thereof.

The sixth lens element E6 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The sixthlens element E6 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the sixth lens element E6 has two inflection points in anoff-axis region thereof. The image-side surface of the sixth lenselement E6 has one inflection point in an off-axis region thereof. Theobject-side surface of the sixth lens element E6 has one concavecritical point in the off-axis region thereof. The image-side surface ofthe sixth lens element E6 has one convex critical point in the off-axisregion thereof.

The seventh lens element E7 with negative refractive power has anobject-side surface being concave in a paraxial region thereof and animage-side surface being convex in a paraxial region thereof. Theseventh lens element E7 is made of plastic material and has theobject-side surface and the image-side surface being both aspheric. Theobject-side surface of the seventh lens element E7 has two inflectionpoints in an off-axis region thereof. The image-side surface of theseventh lens element E7 has two inflection points in an off-axis regionthereof. The object-side surface of the seventh lens element E7 has oneconvex critical point in the off-axis region thereof.

The filter E8 is made of glass material and located between the seventhlens element E7 and the image surface IMG, and will not affect the focallength of the optical imaging system. The image sensor IS is disposed onor near the image surface IMG of the optical imaging system.

The equation of the aspheric surface profiles of the aforementioned lenselements of the 1st embodiment is expressed as follows:

${{X(Y)} = {{\left( {Y^{2}/R} \right)/\left( {1 + {{sqrt}\left( {1 - {\left( {1 + k} \right) \times \left( {Y/R} \right)^{2}}} \right)}} \right)} + {\sum\limits_{i}{({Ai}) \times \left( Y^{i} \right)}}}},$

where,

X is the displacement in parallel with the optical axis from an axialvertex on the aspheric surface to a point at a distance of Y from theoptical axis on the aspheric surface;

Y is the vertical distance from the point on the aspheric surface to theoptical axis;

R is the curvature radius;

k is the conic coefficient; and

Ai is the i-th aspheric coefficient, and in the embodiments, i may be,but is not limited to, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28,and 30.

In the optical imaging system of the image capturing unit according tothe 1st embodiment, when a focal length of the optical imaging system isf, an f-number of the optical imaging system is Fno, and half of amaximum field of view of the optical imaging system is HFOV, theseparameters have the following values: f=6.41 millimeters (mm), Fno=1.94,and HFOV=43.6 degrees (deg.).

When an Abbe number of the first lens element E1 is V1, an Abbe numberof the second lens element E2 is V2, an Abbe number of the third lenselement E3 is V3, an Abbe number of the fourth lens element E4 is V4,and an Abbe number of the fifth lens element E5 is V5, the followingcondition is satisfied: (V1+V3)/(V2+V4+V5)=2.08.

When the Abbe number of the first lens element E1 is V1, the Abbe numberof the second lens element E2 is V2, and the Abbe number of the thirdlens element E3 is V3, the following condition is satisfied:(V1+V3)/V2=6.58.

When a central thickness of the fifth lens element E5 is CT5, a centralthickness of the sixth lens element E6 is CT6, and an axial distancebetween the fifth lens element E5 and the sixth lens element E6 is T56,the following condition is satisfied: (CT5+CT6)/T56=1.31. In thisembodiment, an axial distance between two adjacent lens elements is adistance in a paraxial region between two adjacent lens surfaces of thetwo adjacent lens elements.

When a central thickness of the third lens element E3 is CT3, and anaxial distance between the second lens element E2 and the third lenselement E3 is T23, the following condition is satisfied: CT3/T23=1.31.

When an axial distance between the sixth lens element E6 and the seventhlens element E7 is T67, and an axial distance between the image-sidesurface of the seventh lens element E7 and the image surface IMG is BL,the following condition is satisfied:

When an axial distance between the object-side surface of the first lenselement E1 and the image-side surface of the seventh lens element E7 isTD, and the axial distance between the image-side surface of the seventhlens element E7 and the image surface IMG is BL, the following conditionis satisfied: TD/BL=11.80.

When an axial distance between the object-side surface of the first lenselement E1 and the image surface IMG is TL, and a maximum image heightof the optical imaging system is ImgH, the following condition issatisfied: TL/ImgH=1.12.

When a curvature radius of the object-side surface of the first lenselement E1 is R1, and a curvature radius of the image-side surface ofthe first lens element E1 is R2, the following condition is satisfied:(R1+R2)/(R1−R2)=−2.43.

When a curvature radius of the image-side surface of the sixth lenselement E6 is R12, and a curvature radius of the object-side surface ofthe seventh lens element E7 is R13, the following condition issatisfied: (R12−R13)/(R12+R13)=2.22.

When a curvature radius of the image-side surface of the seventh lenselement E7 is R14, and the focal length of the optical imaging system isf, the following condition is satisfied: R14/f=−1.76.

When the curvature radius of the image-side surface of the seventh lenselement E7 is R14, and a focal length of the seventh lens element E7 isf7, the following condition is satisfied: R14/f7=2.53.

When the focal length of the optical imaging system is f, a focal lengthof the second lens element E2 is f2, a focal length of the third lenselement E3 is f3, a focal length of the fourth lens element E4 is f4,and a focal length of the fifth lens element E5 is f5, the followingcondition is satisfied: |f/f2|+|f/f3|+|f/f4|+|f/f5|=0.77. When the focallength of the optical imaging system is f, and a composite focal lengthof the second lens element E2, the third lens element E3 and the fourthlens element E4 is f234, the following condition is satisfied:|f234/f|=19.24.

When a focal length of the sixth lens element E6 is f6, a curvatureradius of the object-side surface of the sixth lens element E6 is R11,and the curvature radius of the image-side surface of the sixth lenselement E6 is R12, the following condition is satisfied:

|f6|/R11+|f6|/R12=6.97.

When the focal length of the optical imaging system is f, the curvatureradius of the object-side surface of the seventh lens element E7 is R13,and the curvature radius of the image-side surface of the seventh lenselement E7 is R14, the following condition is satisfied:f/R13+f/R14=−3.74.

When the focal length of the optical imaging system is f, and acurvature radius of the image-side surface of the second lens element E2is R4, the following condition is satisfied: f/R4=0.63.

When a focal length of the first lens element E1 is f1, and a centralthickness of the first lens element E1 is CT1, the following conditionis satisfied: f1/CT1=7.92.

When an angle between the optical axis and a chief ray at a maximumfield of view emerging from the image-side surface of the seventh lenselement E7 is Ang72c, the following condition is satisfied:|Ang72c|=42.0 degrees.

When an angle between a plane perpendicular to the optical axis and atangent plane to the image-side surface of the seventh lens element E7at a periphery of an optically effective area is Ang72s, the followingcondition is satisfied: |Ang72s|=12.1 degrees.

When the maximum image height of the optical imaging system is ImgH, amaximum value among refractive indices of all light permeable elementsdisposed between the seventh lens element E7 and the image surface IMGin an optically effective area is NEmax, and the axial distance betweenthe image-side surface of the seventh lens element E7 and the imagesurface IMG is BL, the following condition is satisfied:ImgH×NEmax/BL=21.56. In this embodiment, there is only one lightpermeable element disposed between the seventh lens element E7 and theimage surface IMG, and said light permeable element is the filter E8, soNEmax is equal to the refractive index of the filter E8.

When the axial distance between the image-side surface of the seventhlens element E7 and the image surface IMG is BL, and the maximum imageheight of the optical imaging system is ImgH, the following condition issatisfied: ImgH/BL=11.45.

When a maximum effective radius of the object-side surface of the firstlens element E1 is Y11, and a maximum effective radius of the image-sidesurface of the fourth lens element E4 is Y42, the following condition issatisfied: Y11/Y42=0.94.

When the maximum effective radius of the object-side surface of thefirst lens element E1 is Y11, and a maximum effective radius of theimage-side surface of the seventh lens element E7 is Y72, the followingcondition is satisfied: Y72/Y11=2.72.

When a vertical distance between the concave critical point on theobject-side surface of the sixth lens element E6 and the optical axis isYc61, and a maximum effective radius of the object-side surface of thesixth lens element E6 is Y61, the following condition is satisfied:Yc61/Y61=0.36.

When a vertical distance between the convex critical point on theimage-side surface of the sixth lens element E6 and the optical axis isYc62, and a maximum effective radius of the image-side surface of thesixth lens element E6 is Y62, the following condition is satisfied:Yc62/Y62=0.33.

When a vertical distance between the convex critical point on theobject-side surface of the seventh lens element E7 and the optical axisis Yc71, and a maximum effective radius of the object-side surface ofthe seventh lens element E7 is Y71, the following condition issatisfied: Yc71/Y71=0.89.

The detailed optical data of the 1st embodiment are shown in Table 1 andthe aspheric surface data are shown in Table 2 below.

TABLE 1 1st Embodiment f = 6.41 mm, Fno = 1.94, HFOV = 43.6 deg. Surface# Curvature Radius Thickness Material Index Abbe # Focal Length 0 ObjectPlano Infinity 1 Ape. Stop Plano −0.723 2 Lens 1 2.2163 (ASP) 0.810Glass 1.542 62.9 6.42 3 5.3161 (ASP) 0.282 4 Lens 2 24.4325 (ASP) 0.272Plastic 1.686 18.4 −25.47 5 10.1414 (ASP) 0.209 6 Stop Plano 0.097 7Lens 3 −207.0393 (ASP) 0.400 Plastic 1.529 58.0 18.22 8 −9.216 (ASP)−0.089 9 Stop Plano 0.109 10 Lens 4 196.0784 (ASP) 0.342 Plastic 1.66020.4 −41.01 11 23.7678 (ASP) 0.515 12 Lens 5 15.1489 (ASP) 0.314 Plastic1.669 19.5 −601.13 13 14.4777 (ASP) 0.620 14 Lens 6 3.3288 (ASP) 0.500Plastic 1.566 37.4 14.30 15 5.3482 (ASP) 1.536 16 Lens 7 −2.0233 (ASP)0.523 Plastic 1.566 37.4 −4.45 17 −11.2578 (ASP) 0.200 18 Filter Plano0.110 Glass 1.883 40.8 — 19 Plano 0.236 20 Image Plano — Note: Referencewavelength is 587.6 nm (d-line). An effective radius of the stop S1(Surface 6) is 1.375 mm. An effective radius of the stop S2 (Surface 9)is 1.634 mm.

TABLE 2 Aspheric Coefficients Surface # 2 3 4 5 k= −3.90441E+00−9.72458E−01 0.00000E+00 −2.18582E+01 A4= 3.131104754E−02−9.384297457E−03 −2.482826392E−02 −1.470573299E−02 A6= 4.469424996E−021.321623384E−02 −1.256039231E−02 −1.116047992E−03 A8= −1.045020864E−01−3.269383801E−02 7.887272582E−02 4.643907073E−02 A10= 1.319522294E−014.298956413E−02 −1.498957920E−01 −8.199923555E−02 A12= −1.026995494E−01−3.340380827E−02 1.821679471E−01 1.006017374E−01 A14= 5.054866651E−021.534962100E−02 −1.411122753E−01 −7.777273771E−02 A16= −1.534858001E−02−3.994586467E−03 6.862377378E−02 3.599674701E−02 A18= 2.631475545E−035.213281147E−04 −2.010912069E−02 −9.079861097E−03 A20= −1.959836919E−04−2.476997004E−05 3.211456684E−03 9.661551929E−04 A22= — —−2.114531541E−04 — Surface # 7 8 10 11 k= 0.00000E+00 7.15528E+000.00000E+00 0.00000E+00 A4= 3.542592870E−02 5.147622937E−02−1.643213467E−02 −4.488074556E−02 A6= −1.866249421E−01 −7.538979529E−022.106599622E−02 5.727881074E−03 A8= 5.109182709E−01 −6.590878583E−02−2.316534517E−01 −3.830926296E−03 A10= −9.233822156E−01 1.788642064E−014.057956662E−01 −9.633928302E−03 A12= 1.068846441E+00 −1.122843738E−01−3.349574555E−01 2.052183676E−02 A14= −7.797933460E−01 1.126341658E−021.558221149E−01 −1.539850933E−02 A16= 3.451593271E−01 1.530873103E−02−4.187600104E−02 5.684552601E−03 A18= −8.453318634E−02 −6.340103884E−036.071749713E−03 −1.018546877E−03 A20= 8.774235016E−03 7.583174525E−04−3.682823283E−04 7.006640304E−05 Surface # 12 13 14 15 k= 0.00000E+002.12910E+00 −2.79731E+01 −3.95246E−01 A4= −3.698768464E−02−7.181831094E−02 1.539019628E−02 −2.524701743E−02 A6= −5.076583204E−023.656725715E−02 −5.008440540E−02 −1.119551759E−02 A8= 1.956607576E−01−1.173413943E−02 3.052132899E−02 7.818003059E−03 A10= −3.610529921E−01−3.102997602E−03 −1.191984934E−02 −3.042567837E−03 A12= 4.184050615E−015.343503041E−03 3.048178187E−03 8.453265676E−04 A14= −3.300333180E−01−3.322019259E−03 −5.067829643E−04 −1.646791930E−04 A16= 1.808064173E−011.409256318E−03 5.481136552E−05 2.224454267E−05 A18= −6.860411402E−02−4.092960303E−04 −3.782215173E−06 −2.071708604E−06 A20= 1.765161839E−027.723273231E−05 1.552508708E−07 1.306372649E−07 A22= −2.934118489E−03−8.955587759E−06 −3.013785497E−09 −5.328743837E−09 A24= 2.837667210E−045.781634875E−07 −4.487405545E−12 1.268727038E−10 A26= −1.210341296E−05−1.590038330E−08 8.163467405E−13 −1.338097036E−12 Surface # 16 17 — — k=−1.02891E+00 1.59305E+00 — — A4= −9.064043195E−04 −2.171990470E−02 — —A6= 4.858007502E−03 7.145599176E−03 — — A8= −4.268315883E−03−9.431745469E−04 — — A10= 1.878363896E−03 −3.675126075E−04 — — A12=−4.416015658E−04 2.239927516E−04 — — A14= 6.060476095E−05−5.682160978E−05 — — A16= −4.624050744E−06 8.732352785E−06 — — A18=9.871068017E−08 −8.902703734E−07 — — A20= 1.712623961E−086.217465352E−08 — — A22= −2.024183960E−09 −2.988637876E−09 — — A24=1.100027975E−10 9.717312496E−11 — — A26= −3.419877413E−12−2.040004444E−12 — — A28= 5.864927803E−14 2.493945137E−14 — — A30=−4.322842129E−16 −1.347731333E−16 — —

In Table 1, the curvature radius, the thickness and the focal length areshown in millimeters (mm). Surface numbers 0-20 represent the surfacessequentially arranged from the object side to the image side along theoptical axis. In Table 2, k represents the conic coefficient of theequation of the aspheric surface profiles. A4-A30 represent the asphericcoefficients ranging from the 4th order to the 30th order. The tablespresented below for each embodiment are the corresponding schematicparameter and aberration curves, and the definitions of the tables arethe same as Table 1 and Table 2 of the 1st embodiment. Therefore, anexplanation in this regard will not be provided again.

2nd Embodiment

FIG. 3 is a schematic view of an image capturing unit according to the2nd embodiment of the present disclosure. FIG. 4 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 2ndembodiment. In FIG. 3 , the image capturing unit 2 includes the opticalimaging system (its reference numeral is omitted) of the presentdisclosure and an image sensor IS. The optical imaging system includes,in order from an object side to an image side along an optical axis, anaperture stop ST, a first lens element E1, a second lens element E2, astop S1, a third lens element E3, a stop S2, a fourth lens element E4, afifth lens element E5, a stop S3, a sixth lens element E6, a seventhlens element E7, a filter E8 and an image surface IMG. The opticalimaging system includes seven lens elements (E1, E2, E3, E4, E5, E6 andE7) with no additional lens element disposed between each of theadjacent seven lens elements.

The first lens element E1 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The firstlens element E1 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the first lens element E1 has one inflection point in anoff-axis region thereof. The image-side surface of the first lenselement E1 has one inflection point in an off-axis region thereof.

The second lens element E2 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. Thesecond lens element E2 is made of plastic material and has theobject-side surface and the image-side surface being both aspheric. Theobject-side surface of the second lens element E2 has one inflectionpoint in an off-axis region thereof.

The third lens element E3 with positive refractive power has anobject-side surface being concave in a paraxial region thereof and animage-side surface being convex in a paraxial region thereof. The thirdlens element E3 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric.

The fourth lens element E4 with negative refractive power has anobject-side surface being concave in a paraxial region thereof and animage-side surface being convex in a paraxial region thereof. The fourthlens element E4 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The image-sidesurface of the fourth lens element E4 has one inflection point in anoff-axis region thereof.

The fifth lens element E5 with positive refractive power has anobject-side surface being concave in a paraxial region thereof and animage-side surface being convex in a paraxial region thereof. The fifthlens element E5 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The image-sidesurface of the fifth lens element E5 has two inflection points in anoff-axis region thereof.

The sixth lens element E6 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The sixthlens element E6 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the sixth lens element E6 has two inflection points in anoff-axis region thereof. The image-side surface of the sixth lenselement E6 has three inflection points in an off-axis region thereof.The object-side surface of the sixth lens element E6 has one concavecritical point in the off-axis region thereof. The image-side surface ofthe sixth lens element E6 has one convex critical point in the off-axisregion thereof.

The seventh lens element E7 with negative refractive power has anobject-side surface being concave in a paraxial region thereof and animage-side surface being convex in a paraxial region thereof. Theseventh lens element E7 is made of plastic material and has theobject-side surface and the image-side surface being both aspheric. Theobject-side surface of the seventh lens element E7 has two inflectionpoints in an off-axis region thereof. The image-side surface of theseventh lens element E7 has two inflection points in an off-axis regionthereof. The object-side surface of the seventh lens element E7 has oneconvex critical point in the off-axis region thereof.

The filter E8 is made of glass material and served as a light permeableelement located between the seventh lens element E7 and the imagesurface IMG, and will not affect the focal length of the optical imagingsystem. The image sensor IS is disposed on or near the image surface IMGof the optical imaging system.

The detailed optical data of the 2nd embodiment are shown in Table 3 andthe aspheric surface data are shown in Table 4 below.

TABLE 3 2nd Embodiment f = 6.19 mm, Fno = 1.96, HFOV = 44.6 deg. Surface# Curvature Radius Thickness Material Index Abbe # Focal Length 0 ObjectPlano Infinity 1 Ape. Stop Plano −0.657 2 Lens 1 2.2277 (ASP) 0.766Plastic 1.545 56.1 7.51 3 4.2958 (ASP) 0.160 4 Lens 2 6.7796 (ASP) 0.273Plastic 1.686 18.4 367.45 5 6.8528 (ASP) 0.233 6 Stop Plano 0.127 7 Lens3 −62.4628 (ASP) 0.468 Plastic 1.544 56.0 13.19 8 −6.4523 (ASP) −0.225 9Stop Plano 0.250 10 Lens 4 −9.9995 (ASP) 0.424 Plastic 1.705 14.0 −16.6411 −69.0729 (ASP) 0.453 12 Lens 5 −255.1020 (ASP) 0.329 Plastic 1.68618.4 123.85 13 −63.7740 (ASP) −0.115 14 Stop Plano 0.738 15 Lens 63.3273 (ASP) 0.553 Plastic 1.566 37.4 14.46 16 5.2695 (ASP) 1.487 17Lens 7 −2.0568 (ASP) 0.509 Plastic 1.566 37.4 −4.41 18 −12.7243 (ASP)0.200 19 Filter Plano 0.145 Glass 1.805 25.5 — 20 Plano 0.212 21 ImagePlano — Note: Reference wavelength is 587.6 nm (d-line). An effectiveradius of the stop S1 (Surface 6) is 1.370 mm. An effective radius ofthe stop S2 (Surface 9) is 1.485 mm. An effective radius of the stop S3(Surface 14) is 3,400 mm.

TABLE 4 Aspheric Coefficients Surface # 2 3 4 5 k= −3.84223E+00−1.27992E+00 0.00000E+00 −1.74688E+01 A4= 4.516559088E−02−1.483892092E−02 −4.176526137E−02 −9.461113410E−03 A6= −9.637175656E−039.377111483E−03 6.770014390E−02 −4.919547512E−03 A8= 2.620746866E−034.640752611E−03 −1.880785027E−01 4.269563041E−02 A10= 1.249922728E−02−5.333030435E−02 3.785493625E−01 −7.044275054E−02 A12= −2.446249906E−029.715235565E−02 −4.956895345E−01 7.377958980E−02 A14= 2.142236066E−02−8.737485145E−02 4.307156341E−01 −4.497166331E−02 A16= −1.007894666E−024.308092838E−02 −2.441214428E−01 1.525668109E−02 A18= 2.469998326E−03−1.096901007E−02 8.639975300E−02 −2.448382427E−03 A20= −2.484917574E−041.113184966E−03 −1.722007314E−02 1.227996541E−04 A22= — —1.461306892E−03 — Surface # 7 8 10 11 k= 0.00000E+00 1.24819E+010.00000E+00 0.00000E+00 A4= −9.941220902E−04 6.505019465E−021.752859076E−02 −3.355907173E−02 A6= −2.813217058E−02 −3.342498557E−01−2.427466117E−01 1.333334640E−02 A8= 6.798355991E−02 8.705608292E−016.192087614E−01 −3.274771486E−02 A10= −1.366093620E−01 −1.475535039E+00−1.021158253E+00 4.241013103E−02 A12= 1.722286609E−01 1.591258107E+001.080538800E+00 −3.230102396E−02 A14= −1.349463045E−01 −1.063759021E+00−7.095982389E−01 1.550007893E−02 A16= 6.307594133E−02 4.229352569E−012.769423683E−01 −4.631008655E−03 A18= −1.623580123E−02 −9.112698139E−02−5.846717432E−02 7.867545268E−04 A20= 1.795955654E−03 8.158251056E−035.114283911E−03 −5.722212459E−05 Surface # 12 13 15 16 k= 0.00000E+00−9.90000E+01 −2.67211E+01 −2.94410E−01 A4= −4.628464572E−02−7.133309340E−02 1.760840428E−02 −1.901753189E−02 A6= 2.428840862E−025.453768395E−02 −5.257943465E−02 −1.693586283E−02 A8= −1.317414257E−03−4.227869759E−02 3.356753901E−02 1.145121589E−02 A10= −3.421509078E−022.263325842E−02 −1.342695068E−02 −4.321346135E−03 A12= 4.466983761E−02−5.795185768E−03 3.473033643E−03 1.106410328E−03 A14= −2.967100065E−02−2.259556898E−03 −5.861491199E−04 −1.963826345E−04 A16= 1.090767562E−022.803988274E−03 6.514845714E−05 2.433518733E−05 A18= −1.695315614E−O3−1.204895024E−03 −4.721700887E−06 −2.098769413E−06 A20= −2.163747554E−042.861111888E−04 2.131986405E−07 1.234468807E−07 A22= 1.371570885E−04−3.958950001E−05 −5.307423515E−09 −4.718524013E−09 A24= −2.158084367E−052.998073210E−06 4.768796590E−11 1.055359928E−10 A26= 1.196206062E−06−9.634690291E−08 3.013128988E−13 −1.046816427E−12 Surface # 17 18 — — k=−1.02762E+00 1.21880E+00 — — A4= 7.078839939E−03 −1.836817249E−02 — —A6= 6.291715397E−03 1.177644516E−02 — — A8= −1.032992027E−02−4.873742024E−03 — — A10= 5.404786744E−03 1.028009754E−03 — — A12=−1.513513687E−03 −7.832160375E−05 — — A14= 2.663046335E−04−1.178238069E−05 — — A16= −3.145755291E−05 3.870998001E−06 — — A18=2.562185388E−06 −5.022001735E−07 — — A20= −1.441572362E−073.924918864E−08 — — A22= 5.478568511E−09 −2.001784935E−09 — — A24=−1.325548492E−10 6.721183203E−11 — — A26= 1.764842702E−12−1.434722404E−12 — — A28= −7.262260259E−15 1.766557409E−14 — — A30=−5.483728030E−17 −9.555726645E−17 — —

In the 2nd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 2nd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 3 and Table 4 asthe following values and satisfy the following conditions:

2nd Embodiment f [mm] 6.19 |f234/f| 9.02 Fno 1.96 |f6|/R11 + |f6|/R127.09 HFOV [deg.] 44.6 f/R13 + f/R14 −3.49 (V1 + V3)/(V2 + V4 + V5) 2.21f/R4 0.90 (V1 + V3)/V2 6.10 f1/CT1 9.80 (CT5 + CT6)/T56 1.42 |Ang72c|[deg.] 43.0 CT3/T23 1.30 |Ang72s| [deg.] 13.5 T67/BL 2.67 ImgH ×NEmax/BL 20.23 TD/BL 11.54 ImgH/BL 11.21 TL/ImgH 1.12 Y11/Y42 0.92 (R1 +R2)/(R1 − R2) −3.15 Y72/Y11 2.89 (R12 − R13)/(R12 + R13) 2.28 Yc61/Y610.36 R14/f −2.06 Yc62/Y62 0.34 R14/f7 2.89 Yc71/Y71 0.88 |f/f2| +|f/f3| + |f/f4| + |f/f5| 0.91 — —

3rd Embodiment

FIG. 5 is a schematic view of an image capturing unit according to the3rd embodiment of the present disclosure. FIG. 6 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 3rdembodiment. In FIG. 5 , the image capturing unit 3 includes the opticalimaging system (its reference numeral is omitted) of the presentdisclosure and an image sensor IS. The optical imaging system includes,in order from an object side to an image side along an optical axis, anaperture stop ST, a first lens element E1, a second lens element E2, astop S1, a third lens element E3, a stop S2, a fourth lens element E4, afifth lens element E5, a sixth lens element E6, a seventh lens elementE7, a filter E8 and an image surface IMG. The optical imaging systemincludes seven lens elements (E1, E2, E3, E4, E5, E6 and E7) with noadditional lens element disposed between each of the adjacent seven lenselements.

The first lens element E1 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The firstlens element E1 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the first lens element E1 has one inflection point in anoff-axis region thereof. The image-side surface of the first lenselement E1 has one inflection point in an off-axis region thereof.

The second lens element E2 with negative refractive power has anobject-side surface being concave in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. Thesecond lens element E2 is made of plastic material and has theobject-side surface and the image-side surface being both aspheric. Theobject-side surface of the second lens element E2 has one inflectionpoint in an off-axis region thereof.

The third lens element E3 with negative refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The thirdlens element E3 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the third lens element E3 has one inflection point in anoff-axis region thereof. The image-side surface of the third lenselement E3 has one inflection point in an off-axis region thereof.

The fourth lens element E4 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being convex in a paraxial region thereof. The fourthlens element E4 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the fourth lens element E4 has three inflection points in anoff-axis region thereof. The image-side surface of the fourth lenselement E4 has one inflection point in an off-axis region thereof.

The fifth lens element E5 with negative refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The fifthlens element E5 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the fifth lens element E5 has two inflection points in anoff-axis region thereof. The image-side surface of the fifth lenselement E5 has three inflection points in an off-axis region thereof.

The sixth lens element E6 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The sixthlens element E6 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the sixth lens element E6 has two inflection points in anoff-axis region thereof. The image-side surface of the sixth lenselement E6 has four inflection points in an off-axis region thereof. Theobject-side surface of the sixth lens element E6 has one concavecritical point in the off-axis region thereof. The image-side surface ofthe sixth lens element E6 has one convex critical point in the off-axisregion thereof.

The seventh lens element E7 with negative refractive power has anobject-side surface being concave in a paraxial region thereof and animage-side surface being convex in a paraxial region thereof. Theseventh lens element E7 is made of plastic material and has theobject-side surface and the image-side surface being both aspheric. Theobject-side surface of the seventh lens element E7 has two inflectionpoints in an off-axis region thereof. The image-side surface of theseventh lens element E7 has two inflection points in an off-axis regionthereof. The object-side surface of the seventh lens element E7 has oneconvex critical point in the off-axis region thereof.

The filter E8 is made of glass material and served as a light permeableelement located between the seventh lens element E7 and the imagesurface IMG, and will not affect the focal length of the optical imagingsystem. The image sensor IS is disposed on or near the image surface IMGof the optical imaging system.

The detailed optical data of the 3rd embodiment are shown in Table 5 andthe aspheric surface data are shown in Table 6 below.

TABLE 5 3rd Embodiment f = 6.30 mm, Fno = 1.95, HFOV = 44.2 deg. Surface# Curvature Radius Thickness Material Index Abbe # Focal Length 0 ObjectPlano Infinity 1 Ape. Stop Plano −0.661 2 Lens 1 2.2502 (ASP) 0.763Plastic 1.545 56.1 6.24 3 5.8541 (ASP) 0.282 4 Lens 2 −203.6660 (ASP)0.297 Plastic 1.697 16.3 −19.56 5 14.6207 (ASP) 0.188 6 Stop Plano 0.0607 Lens 3 9.9557 (ASP) 0.285 Plastic 1.544 56.0 −170.14 8 8.8982 (ASP)0.084 9 Stop Plano 0.009 10 Lens 4 12.8381 (ASP) 0.464 Plastic 1.56637.4 21.66 11 −269.5418 (ASP) 0.511 12 Lens 5 15.0844 (ASP) 0.310Plastic 1.614 25.6 −600.94 13 14.3788 (ASP) 0.596 14 Lens 6 3.2808 (ASP)0.539 Plastic 1.562 44.6 14.62 15 5.1405 (ASP) 1.538 16 Lens 7 −2.0283(ASP) 0.506 Plastic 1.562 44.6 −4.44 17 −11.8846 (ASP) 0.347 18 FilterPlano 0.210 Glass 1.755 27.5 — 19 Plano 0.000 20 Image Plano — Note:Reference wavelength is 587.6 nm (d-line). An effective radius of thestop S1 (Surface 6) is 1.380 mm. An effective radius of the stop S2(Surface 9) is 1.658 mm.

TABLE 6 Aspheric Coefficients Surface # 2 3 4 5 k= −4.05122E+00−2.52566E−01 0.00000E+00 2.43409E+01 A4= 3.235588829E−02−3.789544471E−03 −4.415127282E−03 1.050838395E−02 A6= 4.228568188E−02−4.471451514E−03 −2.550301768E−02 −5.026560529E−02 A8= −1.071685243E−018.859949633E−03 1.015945698E−01 1.516694160E−01 A10= 1.459558675E−01−1.683717431E−02 −1.974009894E−01 −2.413592551E−01 A12= −1.233021750E−011.884727381E−02 2.437584744E−01 2.457328219E−01 A14= 6.593033334E−02−1.264898383E−02 −1.921667710E−01 −1.563750999E−01 A16= −2.168951568E−024.990648477E−03 9.628856362E−02 5.997952998E−02 A18= 4.005452223E−03−1.057102531E−03 −2.959866497E−02 −1.257828820E−02 A20= −3.186387341E−049.103585627E−05 5.079514767E−03 1.102833314E−03 A22= — —−3.720742490E−04 — Surface # 7 8 10 11 k= 0.00000E+00 −9.90000E+010.00000E+00 0.00000E+00 A4= 3.445734944E−02 1.190604227E−02−3.773826310E−02 −3.404421069E−02 A6= −1.850458728E−01 −5.401380758E−02−4.438133999E−02 −2.044759862E−02 A8= 4.808649752E−01 1.038968249E−011.433964109E−01 4.859702276E−02 A10= −8.290146558E−01 −1.595572531E−01−2.381498254E−01 −7.132716189E−02 A12= 9.145606277E−01 1.561984599E−012.283409319E−01 6.151862681E−02 A14= −6.421064993E−01 −9.167902394E−02−1.246557404E−01 −3.111996254E−02 A16= 2.756867754E−01 3.123715466E−023.846864719E−02 9.151570752E−03 A18= −6.585824934E−02 −5.745265558E−03−6.247710058E−03 −1.427776120E−03 A20= 6.699130574E−03 4.417635913E−044.133817038E−04 9.015412652E−05 Surface # 12 13 14 15 k= 0.00000E+003.35825E+00 −2.71770E+01 −3.88697E−01 A4= −3.811760866E−02−7.359030382E−02 1.475070646E−02 −2.631092918E−02 A6= −2.659463449E−025.140381426E−02 −4.839990779E−02 −1.018270341E−02 A8= 1.359106370E−01−4.027984594E−02 2.918469694E−02 7.158482420E−03 A10= −2.738435468E−012.915396687E−02 −1.111098225E−02 −2.680594808E−03 A12= 3.322665111E−01−1.854195483E−02 2.735025521E−03 6.986509523E−04 A14= −2.701033071E−018.628105933E−03 −4.317137374E−04 −1.261975612E−04 A16= 1.510826758E−01−2.670786878E−03 4.332062180E−05 1.578702942E−05 A18= −5.814334840E−025.376163351E−04 −2.636825154E−06 −1.369872447E−06 A20= 1.510160359E−02−6.921562799E−05 8.134186037E−08 8.135963290E−08 A22= −2.525579155E−035.459705850E−06 −4.880553060E−11 −3.168431443E−09 A24= 2.451234285E−04−2.377691704E−07 −7.127208711E−11 7.304788664E−11 A26= −1.046721491E−054.300476222E−09 1.455606792E−12 −7.557258448E−13 Surface # 16 17 — — k=−1.02687E+00 1.50052E+00 — — A4= 1.041465171E−02 −1.479923477E−02 — —A6= −4.575587770E−03 4.764383101E−03 — — A8= −9.157348417E−05−7.793116559E−04 — — A10= 6.566735824E−04 −2.476865770E−04 — — A12=−2.049638324E−04 1.766179773E−04 — — A14= 3.089762730E−05−4.728285110E−05 — — A16= −2.337254959E−06 7.454480556E−06 — — A18=1.522454086E−08 −7.686505097E−07 — — A20= 1.502865112E−085.384763400E−08 — — A22= −1.596092428E−09 −2.583300996E−09 — — A24=8.593987595E−11 8.356091849E−11 — — A26= −2.693363802E−12−1.741585874E−12 — — A28= 4.675962990E−14 2.110916899E−14 — — A30=−3.490566303E−16 −1.129983707E−16 — —

In the 3rd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 3rd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 5 and Table 6 asthe following values and satisfy the following conditions:

3rd Embodiment f [mm] 6.30 |f234/f| 14.91 Fno 1.95 |f6|/R11 + |f6|/R127.30 HFOV [deg.] 44.2 f/R13 + f/R14 −3.64 (V1 + V3)/(V2 + V4 + V5) 1.41f/R4 0.43 (V1 + V3)/V2 6.89 f1/CT1 8.18 (CT5 + CT6)/T56 1.42 |Ang72c|[deg.] 42.1 CT3/T23 1.15 |Ang72s| [deg.] 14.8 T67/BL 2.76 ImgH ×NEmax/BL 19.69 TD/BL 11.55 ImgH/BL 11.22 TL/ImgH 1.12 Y11/Y42 0.91 (R1 +R2)/(R1 − R2) −2.25 Y72/Y11 2.83 (R12 − R13)/(R12 + R13) 2.30 Yc61/Y610.35 R14/f −1.89 Yc62/Y62 0.33 R14/f7 2.68 Yc71/Y71 0.89 |f/f2| +|f/f3| + |f/f4| + |f/f5| 0.66 — —

4th Embodiment

FIG. 7 is a schematic view of an image capturing unit according to the4th embodiment of the present disclosure. FIG. 8 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 4thembodiment. In FIG. 7 , the image capturing unit 4 includes the opticalimaging system (its reference numeral is omitted) of the presentdisclosure and an image sensor IS. The optical imaging system includes,in order from an object side to an image side along an optical axis, anaperture stop ST, a first lens element E1, a second lens element E2, astop S1, a third lens element E3, a stop S2, a fourth lens element E4, afifth lens element E5, a sixth lens element E6, a seventh lens elementE7, a filter E8 and an image surface IMG. The optical imaging systemincludes seven lens elements (E1, E2, E3, E4, E5, E6 and E7) with noadditional lens element disposed between each of the adjacent seven lenselements.

The first lens element E1 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The firstlens element E1 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the first lens element E1 has one inflection point in anoff-axis region thereof. The image-side surface of the first lenselement E1 has one inflection point in an off-axis region thereof.

The second lens element E2 with negative refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. Thesecond lens element E2 is made of plastic material and has theobject-side surface and the image-side surface being both aspheric.

The third lens element E3 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being convex in a paraxial region thereof. The thirdlens element E3 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the third lens element E3 has one inflection point in anoff-axis region thereof.

The fourth lens element E4 with negative refractive power has anobject-side surface being concave in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. Thefourth lens element E4 is made of plastic material and has theobject-side surface and the image-side surface being both aspheric. Theobject-side surface of the fourth lens element E4 has two inflectionpoints in an off-axis region thereof. The image-side surface of thefourth lens element E4 has two inflection points in an off-axis regionthereof.

The fifth lens element E5 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The fifthlens element E5 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the fifth lens element E5 has two inflection points in anoff-axis region thereof. The image-side surface of the fifth lenselement E5 has three inflection points in an off-axis region thereof.

The sixth lens element E6 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The sixthlens element E6 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the sixth lens element E6 has two inflection points in anoff-axis region thereof. The image-side surface of the sixth lenselement E6 has four inflection points in an off-axis region thereof. Theobject-side surface of the sixth lens element E6 has one concavecritical point in the off-axis region thereof. The image-side surface ofthe sixth lens element E6 has one convex critical point in the off-axisregion thereof.

The seventh lens element E7 with negative refractive power has anobject-side surface being concave in a paraxial region thereof and animage-side surface being convex in a paraxial region thereof. Theseventh lens element E7 is made of plastic material and has theobject-side surface and the image-side surface being both aspheric. Theobject-side surface of the seventh lens element E7 has two inflectionpoints in an off-axis region thereof. The image-side surface of theseventh lens element E7 has two inflection points in an off-axis regionthereof. The object-side surface of the seventh lens element E7 has oneconvex critical point in the off-axis region thereof.

The filter E8 is made of glass material and served as a light permeableelement located between the seventh lens element E7 and the imagesurface IMG, and will not affect the focal length of the optical imagingsystem. The image sensor IS is disposed on or near the image surface IMGof the optical imaging system.

The detailed optical data of the 4th embodiment are shown in Table 7 andthe aspheric surface data are shown in Table 8 below.

TABLE 7 4th Embodiment f = 5.96 mm, Fno = 1.89, HFOV = 45.6 deg. Surface# Curvature Radius Thickness Material Index Abbe # Focal Length 0 ObjectPlano Infinity 1 Ape. Stop Plano −0.616 2 Lens 1 2.2534 (ASP) 0.659Plastic 1.545 56.1 7.55 3 4.4667 (ASP) 0.302 4 Lens 2 9.9769 (ASP) 0.313Plastic 1.697 16.3 −36.75 5 7.0882 (ASP) 0.199 6 Stop Plano 0.066 7 Lens3 15.3019 (ASP) 0.557 Plastic 1.544 56.0 9.74 8 −8.0049 (ASP) −0.126 9Stop Plano 0.150 10 Lens 4 −15.8057 (ASP) 0.319 Plastic 1.660 20.4−19.29 11 66.0030 (ASP) 0.427 12 Lens 5 15.0239 (ASP) 0.464 Plastic1.686 18.4 168.39 13 17.0526 (ASP) 0.588 14 Lens 6 3.6327 (ASP) 0.716Plastic 1.614 25.6 17.55 15 5.0685 (ASP) 1.510 16 Lens 7 −2.0521 (ASP)0.519 Plastic 1.614 25.6 −4.09 17 −12.3011 (ASP) 0.216 18 Filter Plano0.110 Glass 1.785 25.7 — 19 Plano 0.000 20 Image Plano — Note: Referencewavelength is 587.6 nm (d-line). An effective radius of the stop S1(Surface 6) is 1.375 mm. An effective radius of the stop S2 (Surface 9)is 1.779 mm.

TABLE 8 Aspheric Coefficients Surface # 2 3 4 5 k= −4.15588E+00−9.36764E−01 0.00000E+00 −2.34544E+01 A4= 2.996063552E−02−6.080752448E−03 −1.913975092E−02 −6.381828786E−03 A6= 5.862847358E−021.462817673E−02 −3.502031218E−O2 −1.104313463E−02 A8= −1.589868723E−01−4.725707721E−02 1.418295211E−01 2.194206955E−02 A10= 2.369566555E−018.464303216E−02 −2.841633726E−01 1.835686693E−02 A12= −2.188643884E−01−9.390870478E−02 3.664579670E−01 −6.806971162E−02 A14= 1.269752922E−016.451340650E−02 −3.067746700E−01 7.769733334E−02 A16= −4.492283876E−02−2.665593982E−02 1.665044749E−01 −4.498577383E−02 A18= 8.845323047E−036.057096656E−03 −5.665634655E−02 1.326885147E−02 A20= −7.437476190E−04−5.827307391E−04 1.099639801E−02 −1.580305608E−03 A22= — —−9.294967981E−04 — Surface # 7 8 10 11 k= 0.00000E+00 1.09361E+010.00000E+00 0.00000E+00 A4= 1.440898417E−02 3.084294340E−02−6.607582173E−03 −3.589024293E−02 A6= −1.124849000E−01 −1.196787004E−01−7.544636718E−02 3.659585704E−03 A8= 3.131668681E−01 1.731679901E−018.638396214E−02 −6.737378267E−03 A10= −5.622069775E−01 −1.818783191E−01−5.584947811E−02 5.024829634E−03 A12= 6.418236706E−01 1.520714158E−013.371954470E−02 4.064294030E−04 A14= −4.623638126E−01 −8.823763549E−02−1.800563231E−02 −2.493559956E−03 A16= 2.030540808E−01 3.152209233E−026.228501597E−03 1.329088838E−03 A18= −4.962448305E−02 −6.239253908E−03−1.129977357E−03 −2.750900300E−04 A20= 5.156073777E−03 5.252549679E−048.093244227E−05 1.994001211E−05 Surface # 12 13 14 15 k= 0.00000E+002.03450E+01 −2.65101E+01 1.50393E−01 A4= −2.190726621E−02−5.040965820E−02 1.000661177E−02 −1.938514676E−02 A6= −4.579623323E−029.214358260E−03 −4.383857530E−02 −1.371671360E−02 A8= 1.632329640E−012.470740854E−02 2.830775608E−02 1.017511154E−02 A10= −3.020191455E−01−4.140825370E−02 −1.094452319E−02 −4.026651074E−03 A12= 3.494149809E−013.388966596E−02 2.407532896E−03 1.043258656E−03 A14= −2.715009726E−01−1.760494292E−02 −2.383767770E−04 −1.824682046E−04 A16= 1.448597685E−016.124571246E−03 −1.095953539E−05 2.185382743E−05 A18= −5.312567600E−02−1.430882681E−03 6.121860523E−06 −1.795059630E−06 A20= 1.314538266E−022.202602088E−04 −7.796178169E−07 9.942972942E−08 A22= −2.093127211E−03−2.135418693E−05 5.104603201E−08 −3.548973602E−09 A24= 1.932077950E−041.179571760E−06 −1.757452260E−09 7.368288707E−11 A26= −7.836909498E−06−2.827662494E−08 2.524328599E−11 −6.758360102E−13 Surface # 16 17 — — k=−1.03043E+00 1.37132E+00 — — A4= −8.435476988E−03 −3.745905119E−02 — —A6= 3.113556983E−02 2.376952972E−02 — — A8= −2.779831528E−02−7.751552377E−03 — — A10= 1.247124516E−02 1.065541468E−03 — — A12=−3.348741774E−03 6.031543478E−05 — — A14= 5.905103448E−04−4.893939163E−05 — — A16= −7.172977382E−05 9.161222233E−06 — — A18=6.141942661E−06 −9.901684441E−07 — — A20= −3.728951815E−077.016321176E−08 — — A22= 1.589199505E−08 −3.365607340E−09 — — A24=−4.616171017E−10 1.085062892E−10 — — A26= 8.606028221E−12−2.253947189E−12 — — A28= −9.108394630E−14 2.725823927E−14 — — A30=4.012012759E−16 −1.457980466E−16 — —

In the 4th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 4th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 7 and Table 8 asthe following values and satisfy the following conditions:

4th Embodiment f [mm] 5.96 |f234/f| 6.88 Fno 1.89 |f6|/R11 + |f6|/R128.29 HFOV [deg.] 45.6 f/R13 + f/R14 −3.39 (V1 + V3)/(V2 + V4 + V5) 2.04f/R4 0.84 (V1 + V3)/V2 6.89 f1/CT1 11.46 (CT5 + CT6)/T56 2.01 |Ang72c|[deg.] 47.6 CT3/T23 2.10 |Ang72s| [deg.] 9.4 T67/BL 4.63 ImgH × NEmax/BL34.18 TD/BL 20.43 ImgH/BL 19.15 TL/ImgH 1.12 Y11/Y42 0.85 (R1 + R2)/(R1− R2) −3.04 Y72/Y11 2.83 (R12 − R13)/(R12 + R13) 2.36 Yc61/Y61 0.38R14/f −2.06 Yc62/Y62 0.36 R14/f7 3.01 Yc71/Y71 0.89 |f/f2| + |f/f3| +|f/f4| + |f/f5| 1.12 — —

5th Embodiment

FIG. 9 is a schematic view of an image capturing unit according to the5th embodiment of the present disclosure. FIG. 10 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 5thembodiment. In FIG. 9 , the image capturing unit 5 includes the opticalimaging system (its reference numeral is omitted) of the presentdisclosure and an image sensor IS. The optical imaging system includes,in order from an object side to an image side along an optical axis, anaperture stop ST, a first lens element E1, a second lens element E2, astop S1, a third lens element E3, a fourth lens element E4, a fifth lenselement E5, a stop S2, a sixth lens element E6, a seventh lens elementE7, a filter E8 and an image surface IMG. The optical imaging systemincludes seven lens elements (E1, E2, E3, E4, E5, E6 and E7) with noadditional lens element disposed between each of the adjacent seven lenselements.

The first lens element E1 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The firstlens element E1 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the first lens element E1 has one inflection point in anoff-axis region thereof. The image-side surface of the first lenselement E1 has one inflection point in an off-axis region thereof.

The second lens element E2 with negative refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. Thesecond lens element E2 is made of plastic material and has theobject-side surface and the image-side surface being both aspheric. Theobject-side surface of the second lens element E2 has two inflectionpoints in an off-axis region thereof.

The third lens element E3 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being convex in a paraxial region thereof. The thirdlens element E3 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the third lens element E3 has one inflection point in anoff-axis region thereof.

The fourth lens element E4 with negative refractive power has anobject-side surface being concave in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. Thefourth lens element E4 is made of plastic material and has theobject-side surface and the image-side surface being both aspheric. Theobject-side surface of the fourth lens element E4 has one inflectionpoint in an off-axis region thereof. The image-side surface of thefourth lens element E4 has two inflection points in an off-axis regionthereof.

The fifth lens element E5 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The fifthlens element E5 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the fifth lens element E5 has two inflection points in anoff-axis region thereof. The image-side surface of the fifth lenselement E5 has three inflection points in an off-axis region thereof.

The sixth lens element E6 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The sixthlens element E6 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the sixth lens element E6 has two inflection points in anoff-axis region thereof. The image-side surface of the sixth lenselement E6 has three inflection points in an off-axis region thereof.The object-side surface of the sixth lens element E6 has one concavecritical point in the off-axis region thereof. The image-side surface ofthe sixth lens element E6 has one convex critical point in the off-axisregion thereof.

The seventh lens element E7 with negative refractive power has anobject-side surface being concave in a paraxial region thereof and animage-side surface being convex in a paraxial region thereof. Theseventh lens element E7 is made of plastic material and has theobject-side surface and the image-side surface being both aspheric. Theobject-side surface of the seventh lens element E7 has two inflectionpoints in an off-axis region thereof. The image-side surface of theseventh lens element E7 has two inflection points in an off-axis regionthereof. The object-side surface of the seventh lens element E7 has oneconvex critical point in the off-axis region thereof.

The filter E8 is made of glass material and served as a light permeableelement located between the seventh lens element E7 and the imagesurface IMG, and will not affect the focal length of the optical imagingsystem. The image sensor IS is disposed on or near the image surface IMGof the optical imaging system.

The detailed optical data of the 5th embodiment are shown in Table 9 andthe aspheric surface data are shown in Table 10 below.

TABLE 9 5th Embodiment f = 6.14 mm, Fno = 1.84, HFOV = 44.8 deg. Surface# Curvature Radius Thickness Material Index Abbe # Focal Length 0 ObjectPlano Infinity 1 Ape. Stop Plano −0.710 2 Lens 1 2.2782 (ASP) 0.797Plastic 1.545 56.1 6.80 3 5.1888 (ASP) 0.251 4 Lens 2 12.4682 (ASP)0.279 Plastic 1.686 18.4 −35.27 5 8.1536 (ASP) 0.215 6 Stop Plano 0.1057 Lens 3 63.4242 (ASP) 0.520 Plastic 1.544 56.0 10.66 8 −6.3633 (ASP)0.034 9 Lens 4 −11.0789 (ASP) 0.280 Plastic 1.656 21.3 −13.27 10 41.0893(ASP) 0.446 11 Lens 5 13.1045 (ASP) 0.359 Plastic 1.686 18.4 88.59 1216.5203 (ASP) −0.179 13 Stop Plano 0.773 14 Lens 6 3.2076 (ASP) 0.579Plastic 1.587 28.3 13.00 15 5.1617 (ASP) 1.540 16 Lens 7 −2.0254 (ASP)0.506 Plastic 1.587 28.3 −4.29 17 −11.2933 (ASP) 0.336 18 Filter Plano0.145 Glass 1.762 26.6 — 19 Plano 0.000 20 Image Plano — Note: Referencewavelength is 587.6 nm (d-line). An effective radius of the stop S1(Surface 6) is 1.390 mm. An effective radius of the stop S2 (Surface 13)is 3.411 mm.

TABLE 10 Aspheric Coefficients Surface # 2 3 4 5 k= −3.95254E+00−1.46903E+00 0.00000E+00 −2.40279E+01 A4= 3.646259536E−02−5.756946943E−03 −3.203296912E−02 −1.459547834E−02 A6= 1.407180082E−02−1.311303400E−02 2.274130419E−02 8.115968691E−03 A8= −3.876981630E−023.561884901E−02 −4.895624600E−02 1.923459335E−02 A10= 4.958789040E−02−5.659327420E−02 1.125007237E−01 −4.273786967E−02 A12= −3.884187612E−025.401604601E−02 −1.567928094E−01 6.456378681E−02 A14= 1.946152675E−02−3.175403252E−02 1.421144845E−01 −5.569905449E−02 A16= −6.093925448E−031.129576136E−02 −8.353864690E−02 2.731142710E−02 A18= 1.091436695E−03−2.235922780E−03 3.048917731E−02 −7.163225386E−03 A20= −8.625269360E−051.883641245E−04 −6.254484055E−03 7.887353229E−04 A22= — —5.502401916E−04 — Surface # 7 8 9 10 k= 0.00000E+00 3.20483E+000.00000E+00 0.00000E+00 A4= 1.638057878E−02 7.090951589E−022.778044846E−02 −2.787291479E−02 A6= −1.370239935E−01 −2.198624107E−01−1.764883779E−01 −4.024859854E−02 A8= 4.044603986E−01 3.295571050E−012.392027866E−01 6.522381490E−02 A10= −7.502176102E−01 −3.968053945E−01−2.622740678E−01 −7.106263653E−02 A12= 8.735456019E−01 3.652173768E−012.415760709E−01 5.453523573E−02 A14= −6.349726992E−01 −2.166410328E−01−1.459104350E−01 −2.678718231E−02 A16= 2.788479282E−01 7.557763668E−025.109520998E−02 7.780535667E−03 A18= −6.762257813E−02 −1.414398595E−02−9.393171088E−03 −1.192451857E−03 A20= 6.935115559E−03 1.098758526E−037.014774940E−04 7.341665333E−05 Surface # 11 12 14 15 k= 0.00000E+008.41695E+00 −2.74502E+01 −2.54341E−01 A4= −4.656428897E−02−8.309722291E−02 1.537603399E−02 −2.688603457E−02 A6= 2.909534825E−027.753942668E−02 −4.966017141E−02 −7.586943635E−03 A8= −3.951280212E−03−7.888468520E−02 3.034757881E−02 5.179876477E−03 A10= −5.085463357E−026.410931946E−02 −1.190897681E−02 −1.863378304E−03 A12= 9.275725154E−02−3.804129401E−02 3.048835620E−03 5.031860296E−04 A14= −8.896598030E−021.547602236E−02 −5.035529565E−04 −9.773631634E−05 A16= 5.330133775E−02−4.204464053E−03 5.329828095E−05 1.316842076E−05 A18= −2.080510613E−027.540660341E−04 −3.478474567E−06 −1.212113142E−06 A20= 5.295280518E−03−8.736782121E−05 1.216483213E−07 7.468734047E−08 A22= −8.480856591E−046.207700840E−06 −8.766487725E−10 −2.945244743E−09 A24= 7.759398741E−05−2.403335988E−07 −7.791096434E−11 6.718813746E−11 A26= −3.089861334E−063.701887573E−09 1.873951005E−12 −6.743089355E−13 Surface # 16 17 — — k=−1.02800E+00 1.54791E+00 — — A4= −6.922545571E−03 −4.064241913E−02 — —A6= 2.621712745E−02 3.519619048E−02 — — A8= −2.403104257E−02−1.658579093E−02 — — A10= 1.103763217E−02 4.513208519E−03 — — A12=−3.030317808E−03 −7.584539610E−04 — — A14= 5.485415485E−047.980747367E−05 — — A16= −6.890352812E−05 −4.863752664E−06 — — A18=6.160556849E−06 9.313310339E−08 — — A20= −3.953040442E−071.038277439E−08 — — A22= 1.808168335E−08 −1.024599491E−09 — — A24=−5.754043605E−10 4.498548273E−11 — — A26= 1.209957357E−11−1.118736231E−12 — — A28= −1.510276121E−13 1.524264102E−14 — — A30=8.465683099E−16 −8.875014595E−17 — —

In the 5th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 5th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 9 and Table 10as the following values and satisfy the following conditions:

5th Embodiment f [mm] 6.14 |f234/f| 17.70 Fno 1.84 |f6|/R11 + |f6|/R126.57 HFOV [deg.] 44.8 f/R13 + f/R14 −3.57 (V1 + V3)/(V2 + V4 + V5) 1.93f/R4 0.75 (V1 + V3)/V2 6.10 f1/CT1 8.53 (CT5 + CT6)/T56 1.58 |Ang72c|[deg.] 42.2 CT3/T23 1.63 |Ang72s| [deg.] 17.4 T67/BL 3.20 ImgH ×NEmax/BL 22.86 TD/BL 13.51 ImgH/BL 12.97 TL/ImgH 1.12 Y11/Y42 0.92 (R1 +R2)/(R1 − R2) −2.57 Y72/Y11 2.73 (R12 − R13)/(R12 + R13) 2.29 Yc61/Y610.35 R14/f −1.84 Yc62/Y62 0.33 R14/f7 2.63 Yc71/Y71 0.89 |f/f2| +|f/f3| + |f/f4| + |f/f5| 1.28 — —

6th Embodiment

FIG. 11 is a schematic view of an image capturing unit according to the6th embodiment of the present disclosure. FIG. 12 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 6thembodiment. In FIG. 11 , the image capturing unit 6 includes the opticalimaging system (its reference numeral is omitted) of the presentdisclosure and an image sensor IS. The optical imaging system includes,in order from an object side to an image side along an optical axis, anaperture stop ST, a first lens element E1, a second lens element E2, astop S1, a third lens element E3, a stop S2, a fourth lens element E4, afifth lens element E5, a sixth lens element E6, a seventh lens elementE7, a filter E8 and an image surface IMG. The optical imaging systemincludes seven lens elements (E1, E2, E3, E4, E5, E6 and E7) with noadditional lens element disposed between each of the adjacent seven lenselements.

The first lens element E1 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The firstlens element E1 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the first lens element E1 has one inflection point in anoff-axis region thereof. The image-side surface of the first lenselement E1 has one inflection point in an off-axis region thereof.

The second lens element E2 with negative refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. Thesecond lens element E2 is made of plastic material and has theobject-side surface and the image-side surface being both aspheric. Theobject-side surface of the second lens element E2 has two inflectionpoints in an off-axis region thereof.

The third lens element E3 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being convex in a paraxial region thereof. The thirdlens element E3 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the third lens element E3 has one inflection point in anoff-axis region thereof.

The fourth lens element E4 with negative refractive power has anobject-side surface being concave in a paraxial region thereof and animage-side surface being convex in a paraxial region thereof. The fourthlens element E4 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the fourth lens element E4 has two inflection points in anoff-axis region thereof. The image-side surface of the fourth lenselement E4 has one inflection point in an off-axis region thereof.

The fifth lens element E5 with negative refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The fifthlens element E5 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the fifth lens element E5 has two inflection points in anoff-axis region thereof. The image-side surface of the fifth lenselement E5 has three inflection points in an off-axis region thereof.

The sixth lens element E6 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The sixthlens element E6 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the sixth lens element E6 has two inflection points in anoff-axis region thereof. The image-side surface of the sixth lenselement E6 has three inflection points in an off-axis region thereof.The object-side surface of the sixth lens element E6 has one concavecritical point in the off-axis region thereof. The image-side surface ofthe sixth lens element E6 has one convex critical point in the off-axisregion thereof.

The seventh lens element E7 with negative refractive power has anobject-side surface being concave in a paraxial region thereof and animage-side surface being convex in a paraxial region thereof. Theseventh lens element E7 is made of plastic material and has theobject-side surface and the image-side surface being both aspheric. Theobject-side surface of the seventh lens element E7 has two inflectionpoints in an off-axis region thereof. The image-side surface of theseventh lens element E7 has two inflection points in an off-axis regionthereof. The object-side surface of the seventh lens element E7 has oneconvex critical point in the off-axis region thereof.

The filter E8 is made of glass material and served as a light permeableelement located between the seventh lens element E7 and the imagesurface IMG, and will not affect the focal length of the optical imagingsystem. The image sensor IS is disposed on or near the image surface IMGof the optical imaging system.

The detailed optical data of the 6th embodiment are shown in Table 11and the aspheric surface data are shown in Table 12 below.

TABLE 11 6th Embodiment f = 6.53 mm, Fno = 1.98, HFOV = 43.1 deg.Surface # Curvature Radius Thickness Material Index Abbe # Focal Length0 Object Plano Infinity 1 Ape. Stop Plano −0.687 2 Lens 1 2.2750 (ASP)0.800 Plastic 1.545 56.1 6.29 3 5.9236 (ASP) 0.288 4 Lens 2 20.7468(ASP) 0.326 Plastic 1.686 18.4 −19.86 5 8.1729 (ASP) 0.212 6 Stop Plano0.084 7 Lens 3 14.7222 (ASP) 0.431 Plastic 1.544 56.0 14.92 8 −17.9105(ASP) −0.121 9 Stop Plano 0.218 10 Lens 4 −7.5758 (ASP) 0.361 Plastic1.686 18.4 −25.44 11 −13.6444 (ASP) 0.360 12 Lens 5 16.2353 (ASP) 0.335Plastic 1.686 18.4 −93.75 13 12.8545 (ASP) 0.533 14 Lens 6 3.3116 (ASP)0.473 Plastic 1.566 37.4 11.66 15 6.3023 (ASP) 1.790 16 Lens 7 −2.0366(ASP) 0.550 Plastic 1.566 37.4 −4.86 17 −8.5855 (ASP) 0.300 18 FilterPlano 0.210 Glass 1.517 64.2 — 19 Plano 0.038 20 Image Plano — Note:Reference wavelength is 587.6 nm (d-line). An effective radius of thestop S1 (Surface 6) is 1.370 mm. An effective radius of the stop S2(Surface 9) is 1.649 mm.

TABLE 12 Aspheric Coefficients Surface # 2 3 4 5 k= −4.38582E+00−1.40003E+00 −2.75237E+01 −2.22661E+01 A4= 4.068990721E−02−1.072853527E−02 −2.870803743E−02 −1.890826342E−02 A6= 1.918796665E−029.594935093E−03 2.283288097E−02 3.699601748E−02 A8= −6.541692914E−O2−2.127948095E−02 −1.894339876E−02 −5.195163395E−02 A10= 9.485011276E−022.629109075E−02 2.069903429E−02 8.417389638E−02 A12= −8.140748402E−02−1.887080687E−02 −1.237875014E−02 −8.980852003E−02 A14= 4.340288487E−027.878284019E−03 2.835057458E−03 6.458316815E−02 A16= −1.410902010E−02−1.859714258E−03 5.175752350E−04 −3.023272879E−02 A18= 2.562372693E−032.286740413E−04 −3.608686623E−04 8.277928577E−03 A20= −1.999160704E−04−1.248013639E−05 4.584245999E−05 −9.849264276E−04 Surface # 7 8 10 11 k=−4.60456E+01 6.61198E+01 −9.03358E+01 −9.44536E+01 A4= −5.893741656E−034.693300171E−02 −3.085960575E−03 −2.025297271E−02 A6= −3.575859022E−02−1.592987923E−01 −5.650152280E−02 −4.638460753E−03 A8= 5.443392069E−022.297215065E−01 7.942058947E−03 −3.236786451E−02 A10= −5.100171774E−02−2.401422016E−01 7.298232441E−02 6.132117775E−02 A12= 2.886131949E−021.886904186E−01 −8.515729023E−02 −5.174067071E−02 A14= −1.236514282E−02−1.044942553E−01 4.618479049E−02 2.475216841E−02 A16= 4.800610601E−033.669478693E−02 −1.360321055E−02 −6.859649907E−03 A18= −1.507397825E−03−7.151550060E−03 2.090838790E−03 1.025178539E−03 A20= 2.373107136E−045.804185172E−04 −1.316146162E−04 −6.374773050E−05 Surface # 12 13 14 15k= −6.17616E+01 −7.22260E−01 −2.02342E+01 0.00000E+00 A4=−2.075599322E−02 −6.004855260E−02 1.034507607E−02 −1.284367515E−02 A6=−9.464448069E−02 6.511642089E−03 −4.271858628E−02 −1.666159188E−02 A8=2.945011256E−01 3.172067465E−02 2.536843067E−02 6.999113976E−03 A10=−5.454587593E−01 −5.044080833E−02 −1.033926903E−02 −1.277666529E−03 A12=6.575589705E−01 4.258857652E−02 3.157092727E−03 −2.808172473E−05 A14=−5.390178675E−01 −2.346817036E−02 −7.286533013E−04 7.933574299E−05 A16=3.050447277E−01 8.781523216E−03 1.256485663E−04 −2.118078255E−05 A18=−1.190363779E−01 −2.223814375E−03 −1.569083656E−05 3.026110675E−06 A20=3.141670711E−02 3.728519592E−04 1.358603348E−06 −2.636063519E−07 A22=−5.347859032E−03 −3.950799802E−05 −7.667959252E−08 1.403455920E−08 A24=5.289149183E−04 2.391492378E−06 2.525042079E−09 −4.212140433E−10 A26=−2.303670743E−05 −6.295011987E−08 −3.670114946E−11 5.472711229E−12Surface # 16 17 — — k= −1.00000E+00 −1.00000E+00 — — A4= 1.149492728E−02−3.134092371E−03 — — A6= 1.251518835E−03 5.122069890E−03 — — A8=−5.527895337E−03 −3.327922576E−03 — — A10= 2.798353091E−039.612265158E−04 — — A12= −7.800776143E−04 −1.606115004E−04 — — A14=1.491145604E−04 1.665962019E−05 — — A16= −2.071091582E−05−1.040790315E−06 — — A18= 2.109537963E−06 2.958889520E−08 — — A20=−1.566061988E−07 7.776755533E−10 — — A22= 8.346929706E−09−1.107518141E−10 — — A24= −3.105874491E−10 4.794570360E−12 — — A26=7.655497240E−12 −1.102485368E−13 — — A28= −1.123142162E−131.342077245E−15 — — A30= 7.425542548E−16 −6.765579325E−18 — —

In the 6th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 6th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 11 and Table 12as the following values and satisfy the following conditions:

6th Embodiment f [mm] 6.53 |f234/f| 6.89 Fno 1.98 |f6|/R11 + |f6|/R125.37 HFOV [deg.] 43.1 f/R13 + f/R14 −3.97 (V1 + V3)/(V2 + V4 + V5) 2.03f/R4 0.80 (V1 + V3)/V2 6.10 f1/CT1 7.86 (CT5 + CT6)/T56 1.52 |Ang72c|[deg.] 41.7 CT3/T23 1.46 |Ang72s| [deg.] 12.5 T67/BL 3.26 ImgH ×NEmax/BL 17.28 TD/BL 12.11 ImgH/BL 11.39 TL/ImgH 1.15 Y11/Y42 0.92 (R1 +R2)/(R1 − R2) −2.25 Y72/Y11 2.72 (R12 − R13)/(R12 + R13) 1.95 Yc61/Y610.40 R14/f −1.32 Yc62/Y62 0.35 R14/f7 1.76 Yc71/Y71 0.92 |f/f2| +|f/f3| + |f/f4| + |f/f5| 1.09 — —

7th Embodiment

FIG. 13 is a schematic view of an image capturing unit according to the7th embodiment of the present disclosure. FIG. 14 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 7thembodiment. In FIG. 13 , the image capturing unit 7 includes the opticalimaging system (its reference numeral is omitted) of the presentdisclosure and an image sensor IS. The optical imaging system includes,in order from an object side to an image side along an optical axis, anaperture stop ST, a first lens element E1, a second lens element E2, astop S1, a third lens element E3, a stop S2, a fourth lens element E4, afifth lens element E5, a sixth lens element E6, a seventh lens elementE7, a filter E8 and an image surface IMG. The optical imaging systemincludes seven lens elements (E1, E2, E3, E4, E5, E6 and E7) with noadditional lens element disposed between each of the adjacent seven lenselements.

The first lens element E1 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The firstlens element E1 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the first lens element E1 has one inflection point in anoff-axis region thereof. The image-side surface of the first lenselement E1 has one inflection point in an off-axis region thereof.

The second lens element E2 with negative refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. Thesecond lens element E2 is made of plastic material and has theobject-side surface and the image-side surface being both aspheric. Theobject-side surface of the second lens element E2 has two inflectionpoints in an off-axis region thereof.

The third lens element E3 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being convex in a paraxial region thereof. The thirdlens element E3 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the third lens element E3 has one inflection point in anoff-axis region thereof.

The fourth lens element E4 with negative refractive power has anobject-side surface being concave in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. Thefourth lens element E4 is made of plastic material and has theobject-side surface and the image-side surface being both aspheric. Theobject-side surface of the fourth lens element E4 has one inflectionpoint in an off-axis region thereof. The image-side surface of thefourth lens element E4 has two inflection points in an off-axis regionthereof.

The fifth lens element E5 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The fifthlens element E5 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the fifth lens element E5 has two inflection points in anoff-axis region thereof. The image-side surface of the fifth lenselement E5 has three inflection points in an off-axis region thereof.

The sixth lens element E6 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The sixthlens element E6 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the sixth lens element E6 has two inflection points in anoff-axis region thereof. The image-side surface of the sixth lenselement E6 has two inflection points in an off-axis region thereof. Theobject-side surface of the sixth lens element E6 has one concavecritical point in the off-axis region thereof. The image-side surface ofthe sixth lens element E6 has one convex critical point in the off-axisregion thereof.

The seventh lens element E7 with negative refractive power has anobject-side surface being concave in a paraxial region thereof and animage-side surface being convex in a paraxial region thereof. Theseventh lens element E7 is made of plastic material and has theobject-side surface and the image-side surface being both aspheric. Theobject-side surface of the seventh lens element E7 has two inflectionpoints in an off-axis region thereof. The image-side surface of theseventh lens element E7 has two inflection points in an off-axis regionthereof. The object-side surface of the seventh lens element E7 has oneconvex critical point in the off-axis region thereof.

The filter E8 is made of glass material and served as a light permeableelement located between the seventh lens element E7 and the imagesurface IMG, and will not affect the focal length of the optical imagingsystem. The image sensor IS is disposed on or near the image surface IMGof the optical imaging system.

The detailed optical data of the 7th embodiment are shown in Table 13and the aspheric surface data are shown in Table 14 below.

TABLE 13 7th Embodiment f = 6.53 mm, Fno = 1.98, HFOV = 43.1 deg.Surface # Curvature Radius Thickness Material Index Abbe # Focal Length0 Object Plano Infinity 1 Ape. Stop Plano −0.741 2 Lens 1 2.1730 (ASP)0.851 Plastic 1.545 56.1 6.15 3 5.3246 (ASP) 0.240 4 Lens 2 21.5731(ASP) 0.292 Plastic 1.686 18.4 −20.71 5 8.5194 (ASP) 0.215 6 Stop Plano0.085 7 Lens 3 28.2813 (ASP) 0.388 Plastic 1.544 56.0 14.31 8 −10.6886(ASP) −0.085 9 Stop Plano 0.132 10 Lens 4 −27.5977 (ASP) 0.317 Plastic1.686 18.4 −22.34 11 34.6186 (ASP) 0.479 12 Lens 5 14.4372 (ASP) 0.335Plastic 1.686 18.4 493.67 13 14.9376 (ASP) 0.642 14 Lens 6 3.3524 (ASP)0.465 Plastic 1.566 37.4 15.05 15 5.2513 (ASP) 1.565 16 Lens 7 −2.0267(ASP) 0.550 Plastic 1.566 37.4 −4.47 17 −11.2230 (ASP) 0.200 18 FilterPlano 0.210 Glass 1.517 64.2 — 19 Plano 0.105 20 Image Plano — Note:Reference wavelength is 587.6 nm (d-line). An effective radius of thestop S1 (Surface 6) is 1.370 mm. An effective radius of the stop S2(Surface 9) is 1.604 mm.

TABLE 14 Aspheric Coefficients Surface # 2 3 4 5 k= −3.80169E+00−1.43277E+00 0.00000E+00 −1.09653E+01 A4= 3.044376867E−02−6.782333406E−03 −2.642019759E−02 −2.582690514E−02 A6= 4.795689337E−02−4.801188775E−03 −1.141092034E−02 5.920021886E−02 A8= −9.851890888E−023.845176938E−03 7.675680236E−02 −1.244257817E−01 A10= 1.081300470E−014.819797808E−04 −1.380002980E−01 2.199731486E−01 A12= −7.138706685E−02−3.076649604E−03 1.585262750E−01 −2.341838385E−01 A14= 2.915503632E−021.872186611E−03 −1.174937458E−01 1.556193988E−01 A16= −7.239116655E−03−3.002294113E−04 5.536253178E−02 −6.309874060E−02 A18= 1.017190291E−03−6.474049501E−05 −1.590518153E−02 1.427323178E−02 A20= −6.456731734E−051.730787239E−05 2.519845903E−03 −1.366406338E−03 A22= — —−1.668154920E−04 — Surface # 7 8 10 11 k= 0.00000E+00 −9.43349E+000.00000E+00 0.00000E+00 A4= 2.953330398E−02 5.379956226E−021.995206172E−03 −4.731742773E−02 A6= −1.691599327E−01 −1.222377606E−01−6.236606041E−02 1.345480825E−02 A8= 4.652225961E−01 2.124624951E−018.853772218E−02 −3.100802761E−03 A10= −8.300424147E−01 −3.439273636E−01−1.268326012E−01 −2.078244646E−02 A12= 9.416365359E−01 3.780562980E−011.322969202E−01 3.147529538E−02 A14= −6.733792972E−01 −2.502894896E−01−7.933176674E−02 −2.061720522E−02 A16= 2.931173321E−01 9.658358838E−022.634051387E−02 7.068562797E−03 A18= −7.092144584E−02 −2.022213974E−02−4.516236586E−03 −1.213963601E−03 A20= 7.305270649E−03 1.782257989E−033.106889347E−04 8.138464866E−05 Surface # 12 13 14 15 k= 0.00000E+007.15190E+00 −2.82065E+01 −3.70660E−01 A4= −3.844137688E−02−6.991996712E−02 1.363715520E−02 −2.873556989E−02 A6= −8.399992014E−022.650855899E−02 −4.648550929E−02 −7.653762715E−03 A8= 3.250202015E−019.799699557E−03 2.705071064E−02 4.779262537E−03 A10= −6.301191701E−01−3.389246715E−02 −1.008019151E−02 −1.502135984E−03 A12= 7.644968334E−013.328063144E−02 2.434976305E−03 3.665743180E−04 A14= −6.237648267E−01−1.972293029E−02 −3.695937323E−04 −6.803313685E−05 A16= 3.504670379E−017.794828302E−03 3.366702446E−05 9.189769438E−06 A18= −1.357930095E−01−2.070973755E−03 −1.532655303E−06 −8.852257449E−07 A20= 3.562002252E−023.624821731E−04 −6.822806121E−09 5.933559573E−08 A22= −6.034313318E−03−3.991596514E−05 4.524355999E−09 −2.628395279E−09 A24= 5.948611468E−042.501187390E−06 −2.083961898E−10 6.894498099E−11 A26= −2.586663654E−05−6.793875296E−08 3.249174285E−12 −8.070303201E−13 Surface # 16 17 — — k=−1.02920E+00 1.73299E+00 — — A4= −1.531681436E−03 −2.119580945E−02 — —A6= 1.182951218E−02 1.307162316E−02 — — A8= −1.317196758E−02−6.020017683E−03 — — A10= 6.801441419E−03 1.519607691E−03 — — A12=−1.998457382E−03 −1.882420557E−04 — — A14= 3.776296067E−042.373765144E−06 — — A16= −4.879179882E−05 2.845573599E−06 — — A18=4.442130873E−06 −4.750872573E−07 — — A20= −2.879964433E−074.128102996E−08 — — A22= 1.322254845E−08 −2.244978481E−09 — — A24=−4.198203363E−10 7.893573706E−11 — — A26= 8.757233901E−12−1.747824559E−12 — — A28= −1.078051625E−13 2.219802888E−14 — — A30=5.923874564E−16 −1.234085825E−16 — —

In the 7th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 7th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 13 and Table 14as the following values and satisfy the following conditions:

7th Embodiment f [mm] 6.53 |f234/f| 6.80 Fno 1.98 |f6|/R11 + |f6|/R127.35 HFOV [deg.] 43.1 f/R13 + f/R14 −3.80 (V1 + V3)/(V2 + V4 + V5) 2.03f/R4 0.77 (V1 + V3)/V2 6.10 f1/CT1 7.23 (CT5 + CT6)/T56 1.25 |Ang72c|[deg.] 42.3 CT3/T23 1.29 |Ang72s| [deg.] 13.3 T67/BL 3.04 ImgH ×NEmax/BL 18.41 TD/BL 12.58 ImgH/BL 12.14 TL/ImgH 1.12 Y11/Y42 0.96 (R1 +R2)/(R1 − R2) −2.38 Y72/Y11 2.74 (R12 − R13)/(R12 + R13) 2.26 Yc61/Y610.35 R14/f −1.72 Yc62/Y62 0.33 R14/f7 2.51 Yc71/Y71 0.88 |f/f2| +|f/f3| + |f/f4| + |f/f5| 1.08 — —

8th Embodiment

FIG. 15 is a schematic view of an image capturing unit according to the8th embodiment of the present disclosure. FIG. 16 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 8thembodiment. In FIG. 15 , the image capturing unit 8 includes the opticalimaging system (its reference numeral is omitted) of the presentdisclosure and an image sensor IS. The optical imaging system includes,in order from an object side to an image side along an optical axis, anaperture stop ST, a first lens element E1, a second lens element E2, astop S1, a third lens element E3, a stop S2, a fourth lens element E4, afifth lens element E5, a sixth lens element E6, a seventh lens elementE7, a filter E8 and an image surface IMG. The optical imaging systemincludes seven lens elements (E1, E2, E3, E4, E5, E6 and E7) with noadditional lens element disposed between each of the adjacent seven lenselements.

The first lens element E1 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The firstlens element E1 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the first lens element E1 has one inflection point in anoff-axis region thereof. The image-side surface of the first lenselement E1 has one inflection point in an off-axis region thereof.

The second lens element E2 with negative refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. Thesecond lens element E2 is made of plastic material and has theobject-side surface and the image-side surface being both aspheric. Theobject-side surface of the second lens element E2 has two inflectionpoints in an off-axis region thereof.

The third lens element E3 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being convex in a paraxial region thereof. The thirdlens element E3 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the third lens element E3 has one inflection point in anoff-axis region thereof.

The fourth lens element E4 with negative refractive power has anobject-side surface being concave in a paraxial region thereof and animage-side surface being convex in a paraxial region thereof. The fourthlens element E4 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the fourth lens element E4 has two inflection points in anoff-axis region thereof. The image-side surface of the fourth lenselement E4 has one inflection point in an off-axis region thereof.

The fifth lens element E5 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The fifthlens element E5 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the fifth lens element E5 has one inflection point in anoff-axis region thereof. The image-side surface of the fifth lenselement E5 has four inflection points in an off-axis region thereof.

The sixth lens element E6 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The sixthlens element E6 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the sixth lens element E6 has two inflection points in anoff-axis region thereof. The image-side surface of the sixth lenselement E6 has five inflection points in an off-axis region thereof. Theobject-side surface of the sixth lens element E6 has one concavecritical point in the off-axis region thereof. The image-side surface ofthe sixth lens element E6 has one convex critical point in the off-axisregion thereof.

The seventh lens element E7 with negative refractive power has anobject-side surface being concave in a paraxial region thereof and animage-side surface being convex in a paraxial region thereof. Theseventh lens element E7 is made of plastic material and has theobject-side surface and the image-side surface being both aspheric. Theobject-side surface of the seventh lens element E7 has two inflectionpoints in an off-axis region thereof. The image-side surface of theseventh lens element E7 has two inflection points in an off-axis regionthereof. The object-side surface of the seventh lens element E7 has oneconvex critical point in the off-axis region thereof.

The filter E8 is made of glass material and served as a light permeableelement located between the seventh lens element E7 and the imagesurface IMG, and will not affect the focal length of the optical imagingsystem. The image sensor IS is disposed on or near the image surface IMGof the optical imaging system.

The detailed optical data of the 8th embodiment are shown in Table 15and the aspheric surface data are shown in Table 16 below.

TABLE 15 8th Embodiment f = 6.02 mm, Fno = 1.98, HFOV = 45.5 deg.Surface # Curvature Radius Thickness Material Index Abbe # Focal Length0 Object Plano Infinity 1 Ape. Stop Plano −0.578 2 Lens 1 2.2887 (ASP)0.695 Plastic 1.545 56.1 6.71 3 5.4656 (ASP) 0.238 4 Lens 2 11.9860(ASP) 0.276 Plastic 1.686 18.4 −39.31 5 8.2207 (ASP) 0.180 6 Stop Plano0.119 7 Lens 3 89.3317 (ASP) 0.563 Plastic 1.544 56.0 9.32 8 −5.3665(ASP) −0.240 9 Stop Plano 0.313 10 Lens 4 −4.2372 (ASP) 0.334 Plastic1.686 18.4 −10.20 11 −11.0871 (ASP) 0.305 12 Lens 5 16.0333 (ASP) 0.358Plastic 1.686 18.4 784.54 13 16.3754 (ASP) 0.506 14 Lens 6 2.8955 (ASP)0.465 Plastic 1.566 37.4 9.48 15 5.9208 (ASP) 1.728 16 Lens 7 −2.0760(ASP) 0.550 Plastic 1.566 37.4 −4.47 17 −12.6320 (ASP) 0.220 18 FilterPlano 0.210 Glass 1.517 64.2 — 19 Plano 0.108 20 Image Plano — Note:Reference wavelength is 587.6 nm (d-line). An effective radius of thestop S1 (Surface 6) is 1.330 mm. An effective radius of the stop S2(Surface 9) is 1.530 mm.

TABLE 16 Aspheric Coefficients Surface # 2 3 4 5 k= −4.20809E+00−2.32536E+00 −3.37678E+01 −3.51021E+01 A4= 4.504925120E−02−1.079861766E−02 −2.780413163E−02 −2.106504260E−02 A6= −2.330689430E−036.717270275E−03 −1.926914492E−02 2.581946837E−02 A8= −2.820237912E−02−1.418264215E−02 1.200610923E−01 −3.505865748E−02 A10= 7.466094264E−021.966543239E−02 −2.568334149E−01 6.880087951E−02 A12= −9.845276751E−02−1.727604979E−02 3.432699978E−01 −7.933997386E−02 A14= 7.501462708E−029.273574363E−03 −2.926243926E−01 5.586466742E−02 A16= −3.321494749E−02−2.957954764E−03 1.583823234E−01 −2.313991892E−02 A18= 7.930406514E−035.265782383E−04 −5.244229545E−02 5.051277819E−03 A20= −7.911652945E−04−4.595212533E−05 9.643845966E−03 −4.107545454E−04 A22= — —−7.514373673E−04 — Surface # 7 8 10 11 k= 0.00000E+00 6.59304E+00−1.06082E+01 0.00000E+00 A4= −1.216046381E−02 6.201008506E−024.261810914E−02 5.978602687E−03 A6= −2.123243831E−02 −1.805699085E−01−1.800805537E−01 −6.428662293E−02 A8= 3.061807559E−02 2.809989455E−012.207630412E−01 6.753140870E−02 A10= −3.403012769E−02 −3.649887973E−01−2.084483817E−01 −7.539481090E−02 A12= 3.175271137E−02 3.776086382E−011.920642805E−01 8.885323718E−02 A14= −3.124035850E−02 −2.614474008E−01−1.347396804E−01 −7.682010001E−02 A16= 2.204176687E−02 1.077517346E−015.748789955E−02 4.322358206E−02 A18= −8.534603923E−03 −2.365171764E−02−1.297131902E−02 −1.538663704E−02 A20= 1.354509495E−03 2.116702666E−031.183772821E−03 3.330077641E−03 A22= — — — −3.968706433E−04 A24= — — —1.978111355E−05 Surface # 12 13 14 15 k= −5.05396E+01 −8.68354E+01−2.24845E+01 3.30829E−01 A4= −5.173767487E−02 −1.023077818E−019.615063962E−03 −2.876494764E−02 A6= 4.295929627E−02 1.176070941E−01−4.303695133E−02 −1.060755176E−03 A8= −1.959439280E−02 −1.211367924E−012.838192621E−02 −2.041189611E−03 A10= −5.464816594E−02 9.093913212E−02−1.233536170E−02 2.829887095E−03 A12= 1.063600690E−01 −5.107296768E−023.633515469E−03 −1.484612774E−03 A14= −9.836500103E−02 2.087433306E−02−7.551632910E−04 4.460700768E−04 A16= 5.646703168E−02 −5.988705871E−031.160634558E−04 −8.380751796E−05 A18= −2.123637698E−02 1.164753648E−03−1.331505947E−05 1.017402375E−05 A20= 5.227935345E−03 −1.446883491E−041.099798325E−06 −7.995508130E−07 A22= −8.084622085E−04 1.004740017E−05−6.078671900E−08 3.934762218E−08 A24= 7.064637369E−05 −2.515636279E−071.985576253E−09 −1.103456192E−09 A26= −2.615294724E−06 −4.683631294E−09−2.874741272E−11 1.346532723E−11 Surface # 16 17 — — k= −1.00936E+007.01224E−01 — — A4= 1.352040221E−02 1.022752408E−02 — — A6=−3.487093597E−03 −6.705094572E−03 — — A8= −3.351374813E−032.443892107E−03 — — A10= 2.849464675E−03 −7.471551209E−04 — — A12=−1.087658528E−03 1.759026496E−04 — — A14= 2.604975336E−04−2.993756856E−05 — — A16= −4.217623196E−05 3.624453297E−06 — — A18=4.753265200E−06 −3.118895457E−07 — — A20= −3.773483322E−071.902696207E−08 — — A22= 2.104601477E−08 −8.134273356E−10 — — A24=−8.079673668E−10 2.373361766E−11 — — A26= 2.034734618E−11−4.485277239E−13 — — A28= −3.027953044E−13 4.930432917E−15 — — A30=2.019015088E−15 −2.384091691E−17 — —

In the 8th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 8th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 15 and Table 16as the following values and satisfy the following conditions:

8th Embodiment f [mm] 6.02 |f234/f| 10.11 Fno 1.98 |f6|/R11 + |f6|/R124.88 HFOV [deg.] 45.5 f/R13 + f/R14 −3.38 (V1 + V3)/(V2 + V4 + V5) 2.03f/R4 0.73 (V1 + V3)/V2 6.10 f1/CT1 9.65 (CT5 + CT6)/T56 1.63 |Ang72c|[deg.] 43.7 CT3/T23 1.88 |Ang72s| [deg.] 8.0 T67/BL 3.21 ImgH × NEmax/BL17.62 TD/BL 11.88 ImgH/BL 11.61 TL/ImgH 1.11 Y11/Y42 0.89 (R1 + R2)/(R1− R2) −2.44 Y72/Y11 3.10 (R12 − R13)/(R12 + R13) 2.08 Yc61/Y61 0.39R14/f −2.10 Yc62/Y62 0.34 R14/f7 2.82 Yc71/Y71 0.87 |f/f2| + |f/f3| +|f/f4| + |f/f5| 1.40 — —

9th Embodiment

FIG. 17 is a schematic view of an image capturing unit according to the9th embodiment of the present disclosure. FIG. 18 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 9thembodiment. In FIG. 17 , the image capturing unit 9 includes the opticalimaging system (its reference numeral is omitted) of the presentdisclosure and an image sensor IS. The optical imaging system includes,in order from an object side to an image side along an optical axis, anaperture stop ST, a first lens element E1, a second lens element E2, astop S1, a third lens element E3, a stop S2, a fourth lens element E4, afifth lens element E5, a sixth lens element E6, a seventh lens elementE7, a filter E8 and an image surface IMG. The optical imaging systemincludes seven lens elements (E1, E2, E3, E4, E5, E6 and E7) with noadditional lens element disposed between each of the adjacent seven lenselements.

The first lens element E1 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The firstlens element E1 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the first lens element E1 has one inflection point in anoff-axis region thereof. The image-side surface of the first lenselement E1 has one inflection point in an off-axis region thereof.

The second lens element E2 with negative refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. Thesecond lens element E2 is made of plastic material and has theobject-side surface and the image-side surface being both aspheric.

The third lens element E3 with positive refractive power has anobject-side surface being concave in a paraxial region thereof and animage-side surface being convex in a paraxial region thereof. The thirdlens element E3 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the third lens element E3 has one inflection point in anoff-axis region thereof. The image-side surface of the third lenselement E3 has two inflection points in an off-axis region thereof.

The fourth lens element E4 with negative refractive power has anobject-side surface being concave in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. Thefourth lens element E4 is made of plastic material and has theobject-side surface and the image-side surface being both aspheric. Theobject-side surface of the fourth lens element E4 has two inflectionpoints in an off-axis region thereof. The image-side surface of thefourth lens element E4 has two inflection points in an off-axis regionthereof.

The fifth lens element E5 with negative refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The fifthlens element E5 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the fifth lens element E5 has two inflection points in anoff-axis region thereof. The image-side surface of the fifth lenselement E5 has four inflection points in an off-axis region thereof.

The sixth lens element E6 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The sixthlens element E6 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the sixth lens element E6 has two inflection points in anoff-axis region thereof. The image-side surface of the sixth lenselement E6 has five inflection points in an off-axis region thereof. Theobject-side surface of the sixth lens element E6 has one concavecritical point in the off-axis region thereof. The image-side surface ofthe sixth lens element E6 has one convex critical point in the off-axisregion thereof.

The seventh lens element E7 with negative refractive power has anobject-side surface being concave in a paraxial region thereof and animage-side surface being convex in a paraxial region thereof. Theseventh lens element E7 is made of plastic material and has theobject-side surface and the image-side surface being both aspheric. Theobject-side surface of the seventh lens element E7 has one inflectionpoint in an off-axis region thereof. The image-side surface of theseventh lens element E7 has one inflection point in an off-axis regionthereof. The object-side surface of the seventh lens element E7 has oneconvex critical point in the off-axis region thereof.

The filter E8 is made of glass material and served as a light permeableelement located between the seventh lens element E7 and the imagesurface IMG, and will not affect the focal length of the optical imagingsystem. The image sensor IS is disposed on or near the image surface IMGof the optical imaging system.

The detailed optical data of the 9th embodiment are shown in Table 17and the aspheric surface data are shown in Table 18 below.

TABLE 17 9th Embodiment f = 6.03 mm, Fno = 1.98, HFOV = 45.5 deg.Surface # Curvature Radius Thickness Material Index Abbe # Focal Length0 Object Plano Infinity 1 Ape. Stop Plano −0.474 2 Lens 1 2.4752 (ASP)0.695 Plastic 1.545 55.6 6.20 3 8.3206 (ASP) 0.040 4 Lens 2 8.9339 (ASP)0.270 Plastic 1.686 18.4 −31.38 5 6.2361 (ASP) 0.244 6 Stop Plano 0.1857 Lens 3 −20.3246 (ASP) 0.728 Plastic 1.544 56.0 13.55 8 −5.4792 (ASP)−0.176 9 Stop Plano 0.206 10 Lens 4 −17.2898 (ASP) 0.300 Plastic 1.68618.4 −21.49 11 100.8585 (ASP) 0.530 12 Lens 5 7.1594 (ASP) 0.335 Plastic1.639 23.5 −29.21 13 5.0791 (ASP) 0.461 14 Lens 6 2.7638 (ASP) 0.516Plastic 1.544 56.0 8.64 15 6.2623 (ASP) 1.517 16 Lens 7 −2.0062 (ASP)0.540 Plastic 1.534 56.0 −4.17 17 −22.1879 (ASP) 0.220 18 Filter Plano0.210 Glass 1.517 64.2 — 19 Plano 0.104 20 Image Plano — Note: Referencewavelength is 587.6 nm (d-line). An effective radius of the stop S1(Surface 6) is 1.335 mm. An effective radius of the stop S2 (Surface 9)is 1.580 mm.

TABLE 18 Aspheric Coefficients Surface # 2 3 4 5 k= −5.12281E+00−3.45462E+01 0.00000E+00 −7.12303E+00 A4= 3.841708023E−02−7.088760014E−O2 −8.197341895E−02 −2.416813413E−02 A6= 3.025415422E−039.995864481E−02 1.200560751E−01 7.788444663E−02 A8= −3.347097512E−02−7.341224678E−02 −1.069065588E−01 −1.841521872E−01 A10= 6.145932314E−02−1.445831413E−02 2.706685293E−02 3.273284556E−01 A12= −6.541167188E−029.118819979E−02 6.720454157E−O2 −3.928076413E−01 A14= 4.270996305E−02−9.144007876E−02 −9.400016171E−02 3.059583590E−01 A16= −1.683737037E−024.516475005E−02 5.825139061E−02 −1.471229185E−01 A18= 3.652220437E−03−1.136074084E−02 −1.946476805E−02 3.966687687E−02 A20= −3.353973369E−041.156838239E−03 3.377554013E−03 −4.554387157E−03 A22= — —−2.393131926E−04 — Surface # 7 8 10 11 k= 0.00000E+00 −2.97309E−018.49551E+01 0.00000E+00 A4= −4.037460522E−03 3.500396887E−02−4.006985248E−03 −5.121256093E−02 A6= −5.203481890E−02 −1.370486181E−01−4.592530211E−03 8.554982325E−02 A8= 1.189441261E−01 2.485595823E−01−8.733545950E−02 −1.858729601E−01 A10= −1.777648012E−01 −3.267977932E−012.005548968E−01 2.467040942E−01 A12= 1.614283624E−01 2.882223110E−01−2.222423830E−01 −2.115733717E−01 A14= −8.873456866E−02 −1.639915091E−011.430385176E−01 1.230930788E−01 A16= 2.785818289E−02 5.716276732E−02−5.457605475E−02 −5.103880556E−02 A18= −4.043342788E−03 −1.092327484E−021.153494320E−02 1.592178884E−02 A20= 1.240064021E−04 8.608313037E−04−1.044265087E−03 −3.882243100E−03 A22= — — — 7.141620213E−04 A24= — — —−8.479724869E−05 A26= — — — 4.603690624E−06 Surface # 12 13 14 15 k=−4.43928E+01 −5.43913E+01 −1.93108E+01 1.48540E−01 A4= −7.088018154E−02−7.955792084E−02 2.167386193E−02 −1.720363918E−02 A6= 7.028895774E−029.160372872E−02 −5.536134341E−02 −1.317550091E−02 A8= −2.150905890E−02−9.302189160E−02 4.352059845E−02 9.444505336E−03 A10= −1.174052096E−016.532140429E−02 −2.411803396E−02 −4.530147096E−03 A12= 2.480495413E−01−3.267270404E−02 8.940521600E−03 1.385865944E−03 A14= −2.671411304E−011.152375462E−02 −2.229018912E−03 −2.640774531E−04 A16= 1.825693961E−01−2.761821909E−03 3.801442214E−04 3.189620770E−05 A18= −8.299227834E−024.135052419E−04 −4.445222381E−05 −2.432010919E−06 A20= 2.501275166E−02−3.021138072E−05 3.502764648E−06 1.109750820E−07 A22= −4.798866916E−03−4.846633476E−07 −1.776753428E−07 −2.539917572E−09 A24= 5.298145048E−042.382225731E−07 5.237884195E−09 8.472622032E−12 A26= −2.555911625E−05−1.155560583E−08 −6.820002942E−11 4.966899845E−13 Surface # 16 17 — — k=−1.03977E+00 −5.34268E+00 — — A4= 1.442348449E−03 −1.582689702E−02 — —A6= 8.066734609E−03 1.016234698E−02 — — A8= −1.077872909E−02−4.727137923E−03 — — A10= 5.705018144E−03 1.308846962E−03 — — A12=−1.694890178E−03 −2.324323277E−04 — — A14= 3.270640366E−042.875754030E−05 — — A16= −4.370227065E−05 −2.664728022E−06 — — A18=4.162740248E−06 1.952041911E−07 — — A20= −2.853400965E−07−1.150942641E−08 — — A22= 1.398820136E−08 5.310369930E−10 — — A24=−4.788441373E−10 −1.801895920E−11 — — A26= 1.087622300E−114.130957230E−13 — — A28= −1.473064205E−13 −5.629361531E−15 — — A30=9.003835942E−16 3.414076199E−17 — —

In the 9th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 9th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 17 and Table 18as the following values and satisfy the following conditions:

9th Embodiment f [mm] 6.03 |f234/f| 38.83 Fno 1.98 |f6|/R11 + |f6|/R124.51 HFOV [deg.] 45.5 f/R13 + f/R14 −3.28 (V1 + V3)/(V2 + V4 + V5) 1.85f/R4 0.97 (V1 + V3)/V2 6.07 f1/CT1 8.93 (CT5 + CT6)/T56 1.85 |Ang72c|[deg.] 43.6 CT3/T23 1.70 |Ang72s| [deg.] 2.1 T67/BL 2.84 ImgH × NEmax/BL17.73 TD/BL 11.96 ImgH/BL 11.69 TL/ImgH 1.11 Y11/Y42 0.88 (R1 + R2)/(R1− R2) −1.85 Y72/Y11 3.14 (R12 − R13)/(R12 + R13) 1.94 Yc61/Y61 0.41R14/f −3.68 Yc62/Y62 0.34 R14/f7 5.32 Yc71/Y71 0.84 |f/f2| + |f/f3| +|f/f4| + |f/f5| 1.12 — —

10th Embodiment

FIG. 19 is a schematic view of an image capturing unit according to the10th embodiment of the present disclosure. FIG. 20 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 10thembodiment. In FIG. 19 , the image capturing unit 10 includes theoptical imaging system (its reference numeral is omitted) of the presentdisclosure and an image sensor IS. The optical imaging system includes,in order from an object side to an image side along an optical axis, anaperture stop ST, a first lens element E1, a second lens element E2, astop S1, a third lens element E3, a stop S2, a fourth lens element E4, afifth lens element E5, a sixth lens element E6, a seventh lens elementE7, a filter E8 and an image surface IMG. The optical imaging systemincludes seven lens elements (E1, E2, E3, E4, E5, E6 and E7) with noadditional lens element disposed between each of the adjacent seven lenselements.

The first lens element E1 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The firstlens element E1 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the first lens element E1 has one inflection point in anoff-axis region thereof. The image-side surface of the first lenselement E1 has one inflection point in an off-axis region thereof.

The second lens element E2 with negative refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. Thesecond lens element E2 is made of plastic material and has theobject-side surface and the image-side surface being both aspheric.

The third lens element E3 with positive refractive power has anobject-side surface being concave in a paraxial region thereof and animage-side surface being convex in a paraxial region thereof. The thirdlens element E3 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the third lens element E3 has one inflection point in anoff-axis region thereof.

The fourth lens element E4 with positive refractive power has anobject-side surface being concave in a paraxial region thereof and animage-side surface being convex in a paraxial region thereof. The fourthlens element E4 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the fourth lens element E4 has two inflection points in anoff-axis region thereof. The image-side surface of the fourth lenselement E4 has one inflection point in an off-axis region thereof.

The fifth lens element E5 with negative refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The fifthlens element E5 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the fifth lens element E5 has two inflection points in anoff-axis region thereof. The image-side surface of the fifth lenselement E5 has three inflection points in an off-axis region thereof.

The sixth lens element E6 with positive refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof. The sixthlens element E6 is made of plastic material and has the object-sidesurface and the image-side surface being both aspheric. The object-sidesurface of the sixth lens element E6 has two inflection points in anoff-axis region thereof. The image-side surface of the sixth lenselement E6 has three inflection points in an off-axis region thereof.The object-side surface of the sixth lens element E6 has one concavecritical point in the off-axis region thereof. The image-side surface ofthe sixth lens element E6 has one convex critical point in the off-axisregion thereof.

The seventh lens element E7 with negative refractive power has anobject-side surface being concave in a paraxial region thereof and animage-side surface being convex in a paraxial region thereof. Theseventh lens element E7 is made of plastic material and has theobject-side surface and the image-side surface being both aspheric. Theobject-side surface of the seventh lens element E7 has two inflectionpoints in an off-axis region thereof. The image-side surface of theseventh lens element E7 has one inflection point in an off-axis regionthereof. The object-side surface of the seventh lens element E7 has oneconvex critical point in the off-axis region thereof.

The filter E8 is made of glass material and served as a light permeableelement located between the seventh lens element E7 and the imagesurface IMG, and will not affect the focal length of the optical imagingsystem. The image sensor IS is disposed on or near the image surface IMGof the optical imaging system.

The detailed optical data of the 10th embodiment are shown in Table 19and the aspheric surface data are shown in Table 20 below.

TABLE 19 10th Embodiment f = 7.81 mm, Fno = 1.98, HFOV = 45.6 deg.Surface # Curvature Radius Thickness Material Index Abbe # Focal Length0 Object Plano Infinity 1 Ape. Stop Plano −0.584 2 Lens 1 3.3424 (ASP)0.879 Plastic 1.545 56.1 8.24 3 11.8642 (ASP) 0.062 4 Lens 2 11.7072(ASP) 0.320 Plastic 1.686 18.4 −34.78 5 7.7668 (ASP) 0.307 6 Stop Plano0.231 7 Lens 3 −26.9731 (ASP) 1.020 Plastic 1.544 56.0 24.02 8 −8.9195(ASP) −0.154 9 Stop Plano 0.184 10 Lens 4 −94.9600 (ASP) 0.388 Plastic1.686 18.4 289.06 11 −64.3204 (ASP) 0.822 12 Lens 5 9.6121 (ASP) 0.438Plastic 1.669 19.5 −18.78 13 5.3461 (ASP) 0.536 14 Lens 6 3.3722 (ASP)0.604 Plastic 1.566 37.4 9.86 15 7.9628 (ASP) 1.959 16 Lens 7 −2.6300(ASP) 0.702 Plastic 1.566 37.4 −5.30 17 −23.4974 (ASP) 0.250 18 FilterPlano 0.210 Glass 1.728 28.3 — 19 Plano 0.322 20 Image Plano — Note:Reference wavelength is 587.6 nm (d-line). An effective radius of thestop S1 (Surface 6) is 1.750 mm. An effective radius of the stop S2(Surface 9) is 2.138 mm.

TABLE 20 Aspheric Coefficients Surface # 2 3 4 5 k= −5.33079E+00−2.98797E+01 0.00000E+00 −1.16091E+01 A4= 1.745615498E−02−2.693795402E−02 −3.356008943E−02 −1.398954677E−02 A6= −2.663769175E−031.499860708E−02 2.566169305E−02 2.879136204E−02 A8= 1.461111773E−041.286620567E−02 −8.668778180E−03 −4.064289371E−02 A10= 5.127326927E−04−3.195796570E−02 −2.394391886E−03 3.977831707E−02 A12= −3.434988888E−042.721292302E−02 1.567000980E−03 −2.637262249E−02 A14= 8.808432143E−05−1.252501023E−02 1.883222093E−03 1.165832246E−02 A16= −5.159487688E−063.282653384E−03 −1.941753179E−03 −3.268752374E−03 A18= −1.693674692E−06−4.607644876E−04 7.191094153E−04 5.236732019E−04 A20= 2.213958809E−072.689710790E−05 −1.236864383E−04 −3.618496502E−05 A22= — —8.275699811E−06 — Surface # 7 8 10 11 k= 0.00000E+00 4.68151E+009.90000E+01 0.00000E+00 A4= −1.090995294E−02 −1.007165089E−02−3.483210737E−02 −1.734916827E−02 A6= 1.070720716E−02 1.395955918E−026.923445064E−02 7.117456189E−03 A8= −2.507346414E−02 −2.629724093E−02−9.115087413E−02 1.107331177E−02 A10= 3.149803189E−02 2.310129876E−026.969552136E−02 −2.579640101E−02 A12= −2.407321710E−02 −1.181980087E−02−3.300603029E−02 2.276243401E−02 A14= 1.128345284E−02 3.723698570E−039.837001273E−03 −1.145451265E−02 A16= −3.167066364E−03 −7.153462114E−04−1.799004101E−03 3.593811015E−03 A18= 4.904001460E−04 7.771538610E−051.848557260E−04 −7.138679303E−04 A20= −3.216738245E−05 −3.704435552E−06−8.183565562E−06 8.682588388E−05 A22= — — — −5.815240113E−06 A24= — — —1.543398277E−07 A26= — — — 8.703332385E−10 Surface # 12 13 14 15 k=−4.23826E+01 −5.09770E+01 −1.96139E+01 2.74580E−01 A4= −1.475246420E−02−2.641228803E−02 6.409417686E−03 −9.057464623E−03 A6= −3.099480750E−025.491189028E−03 −1.190162109E−02 −2.624442617E−03 A8= 6.160941281E−023.407652508E−03 5.629377035E−03 1.487419015E−03 A10= −6.352544222E−02−4.062942069E−03 −1.869305549E−03 −5.138203135E−04 A12= 4.276715514E−021.898007424E−03 4.090216904E−04 1.049480462E−04 A14= −2.011505502E−02−5.332027423E−04 −5.946424562E−05 −1.317815929E−05 A16= 6.707130922E−039.912465162E−05 5.863350892E−06 1.069398365E−06 A18= −1.571919077E−03−1.255959767E−05 −3.940776854E−07 −5.739765092E−08 A20= 2.520164023E−041.079271731E−06 1.777515276E−08 2.025719494E−09 A22= −2.620904080E−05−6.035737587E−08 −5.146152769E−10 −4.514645587E−11 A24= 1.587221275E−061.982234832E−09 8.640101538E−12 5.744980310E−13 A26= −4.234069151E−08−2.896231125E−11 −6.395686833E−14 −3.170593422E−15 Surface # 16 17 — —k= −1.03498E+00 5.13014E+00 — — A4= 3.438098449E−03 −5.382677994E−03 — —A6= −6.246913946E−04 1.174229089E−03 — — A8= 1.776862054E−04−7.685925750E−05 — — A10= −1.203706820E−04 −3.141470460E−05 — — A12=3.675920368E−05 8.260734375E−06 — — A14= −6.014100283E−06−9.507528478E−07 — — A16= 6.218859832E−07 6.407270531E−08 — — A18=−4.390080360E−08 −2.667907459E−09 — — A20= 2.184776882E−096.482980690E−11 — — A22= −7.700645868E−11 −6.078333168E−13 — — A24=1.886612356E−12 −1.207811873E−14 — — A26= −3.060103127E−144.573255259E−16 — — A28= 2.956561363E−16 −5.699299515E−18 — — A30=−1.288520004E−18 2.665893877E−20 — —

In the 10th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 10th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 19 and Table 20as the following values and satisfy the following conditions:

10th Embodiment f [mm] 7.81 |f234/f| 7.20 Fno 1.98 |f6|/R11 + |f6|/R124.16 HFOV [deg.] 45.6 f/R13 + f/R14 −3.30 (V1 + V3)/(V2 + V4 + V5) 1.99f/R4 1.01 (V1 + V3)/V2 6.10 f1/CT1 9.37 (CT5 + CT6)/T56 1.94 |Ang72c|[deg.] 44.4 CT3/T23 1.90 |Ang72s| [deg.] 6.7 T67/BL 2.51 ImgH × NEmax/BL18.06 TD/BL 10.62 ImgH/BL 10.45 TL/ImgH 1.11 Y11/Y42 0.87 (R1 + R2)/(R1− R2) −1.78 Y72/Y11 3.03 (R12 − R13)/(R12 + R13) 1.99 Yc61/Y61 0.41R14/f −3.01 Yc62/Y62 0.36 R14/f7 4.44 Yc71/Y71 0.90 |f/f2| + |f/f3| +|f/f4| + |f/f5| 0.99 — —

11th Embodiment

FIG. 21 is a perspective view of an image capturing unit according tothe 11th embodiment of the present disclosure. In this embodiment, animage capturing unit 100 is a camera module including a lens unit 101, adriving device 102, an image sensor 103 and an image stabilizer 104. Thelens unit 101 includes the optical imaging system disclosed in the 1stembodiment, a barrel and a holder member (their reference numerals areomitted) for holding the optical imaging system. However, the lens unit101 may alternatively be provided with the optical imaging systemdisclosed in other embodiments of the present disclosure, and thepresent disclosure is not limited thereto. The imaging light convergesin the lens unit 101 of the image capturing unit 100 to generate animage with the driving device 102 utilized for image focusing on theimage sensor 103, and the generated image is then digitally transmittedto other electronic component for further processing.

The driving device 102 can have auto focusing functionality, anddifferent driving configurations can be obtained through the usages ofvoice coil motors (VCM), micro electro-mechanical systems (MEMS),piezoelectric systems, or shape memory alloy materials. The drivingdevice 102 is favorable for obtaining a better imaging position of thelens unit 101, so that a clear image of the imaged object can becaptured by the lens unit 101 with different object distances. The imagesensor 103 (for example, CCD or CMOS), which can feature highphotosensitivity and low noise, is disposed on the image surface of theoptical imaging system to provide higher image quality.

The image stabilizer 104, such as an accelerometer, a gyro sensor and aHall Effect sensor, is configured to work with the driving device 102 toprovide optical image stabilization (OIS). The driving device 102working with the image stabilizer 104 is favorable for compensating forpan and tilt of the lens unit 101 to reduce blurring associated withmotion during exposure. In some cases, the compensation can be providedby electronic image stabilization (EIS) with image processing software,thereby improving image quality while in motion or low-light conditions.

12th Embodiment

FIG. 22 is one perspective view of an electronic device according to the12th embodiment of the present disclosure. FIG. 23 is anotherperspective view of the electronic device in FIG. 22 . FIG. 24 is ablock diagram of the electronic device in FIG. 22 .

In this embodiment, an electronic device 200 is a smartphone includingthe image capturing unit 100 disclosed in the 11th embodiment, an imagecapturing unit 100 a, an image capturing unit 100 b, an image capturingunit 100 c, an image capturing unit 100 d, a flash module 201, a focusassist module 202, an image signal processor 203, a display module 204and an image software processor 205. The image capturing unit 100 andthe image capturing unit 100 a are disposed on the same side of theelectronic device 200 and each of the image capturing units 100 and 100a has a single focal point. The focus assist module 202 can be a laserrangefinder or a ToF (time of flight) module, but the present disclosureis not limited thereto. The image capturing unit 100 b, the imagecapturing unit 100 c, the image capturing unit 100 d and the displaymodule 204 are disposed on the opposite side of the electronic device200, and the display module 204 can be a user interface, such that theimage capturing units 100 b, 100 c, 100 d can be front-facing cameras ofthe electronic device 200 for taking selfies, but the present disclosureis not limited thereto. Furthermore, each of the image capturing units100 a, 100 b, 100 c and 100 d can include the optical imaging system ofthe present disclosure and can have a configuration similar to that ofthe image capturing unit 100. In detail, each of the image capturingunits 100 a, 100 b, 100 c and 100 d can include a lens unit, a drivingdevice, an image sensor and an image stabilizer, and each of the lensunit can include an optical lens assembly such as the optical imagingsystem of the present disclosure, a barrel and a holder member forholding the optical lens assembly.

The image capturing unit 100 is a wide-angle image capturing unit, theimage capturing unit 100 a is an ultra-wide-angle image capturing unit,the image capturing unit 100 b is a wide-angle image capturing unit, theimage capturing unit 100 c is an ultra-wide-angle image capturing unit,and the image capturing unit 100 d is a ToF image capturing unit. Inthis embodiment, the image capturing units 100 and 100 a have differentfields of view, such that the electronic device 200 can have variousmagnification ratios so as to meet the requirement of optical zoomfunctionality. In addition, the image capturing unit 100 d can determinedepth information of the imaged object. In this embodiment, theelectronic device 200 includes multiple image capturing units 100, 100a, 100 b, 100 c and 100 d, but the present disclosure is not limited tothe number and arrangement of image capturing units.

When a user captures images of an object 206, the light rays converge inthe image capturing unit 100 or the image capturing unit 100 a togenerate images, and the flash module 201 is activated for lightsupplement. The focus assist module 202 detects the object distance ofthe imaged object 206 to achieve fast auto focusing. The image signalprocessor 203 is configured to optimize the captured image to improveimage quality. The light beam emitted from the focus assist module 202can be either conventional infrared or laser. In addition, the lightrays may converge in the image capturing unit 100 b, 100 c or 100 d togenerate images. The display module 204 can include a touch screen, andthe user is able to interact with the display module 204 and the imagesoftware processor 205 having multiple functions to capture images andcomplete image processing. Alternatively, the user may capture imagesvia a physical button. The image processed by the image softwareprocessor 205 can be displayed on the display module

13th Embodiment

FIG. 25 is one perspective view of an electronic device according to the13th embodiment of the present disclosure.

In this embodiment, an electronic device 300 is a smartphone includingthe image capturing unit 100 disclosed in the 11th embodiment, an imagecapturing unit 100 e, an image capturing unit 100 f, a flash module 301,a focus assist module, an image signal processor, a display module andan image software processor (not shown). The image capturing unit 100,the image capturing unit 100 e and the image capturing unit 100 f aredisposed on the same side of the electronic device 300, while thedisplay module is disposed on the opposite side of the electronic device300. Furthermore, each of the image capturing units 100 e and 100 f caninclude the optical imaging system of the present disclosure and canhave a configuration similar to that of the image capturing unit 100,and the details in this regard will not be provided again.

The image capturing unit 100 is a wide-angle image capturing unit, theimage capturing unit 100 e is a telephoto image capturing unit, and theimage capturing unit 100 f is an ultra-wide-angle image capturing unit.In this embodiment, the image capturing units 100, 100 e and 100 f havedifferent fields of view, such that the electronic device 300 can havevarious magnification ratios so as to meet the requirement of opticalzoom functionality. Moreover, the image capturing unit 100 e can be atelephoto image capturing unit having a light-folding elementconfiguration, such that the total track length of the image capturingunit 100 e is not limited by the thickness of the electronic device 300.Moreover, the light-folding element configuration of the image capturingunit 100 e can be similar to, for example, one of the structures shownin FIG. 28 to FIG. 30 , which can be referred to foregoing descriptionscorresponding to FIG. 28 to FIG. 30 , and the details in this regardwill not be provided again. In this embodiment, the electronic device300 includes multiple image capturing units 100, 100 e and 100 f, butthe present disclosure is not limited to the number and arrangement ofimage capturing units. When a user captures images of an object, lightrays converge in the image capturing unit 100, 100 e or 100 f togenerate images, and the flash module 301 is activated for lightsupplement. Further, the subsequent processes are performed in a mannersimilar to the abovementioned embodiment, so the details in this regardwill not be provided again.

14th Embodiment

FIG. 26 is one perspective view of an electronic device according to the14th embodiment of the present disclosure.

In this embodiment, an electronic device 400 is a smartphone includingthe image capturing unit 100 disclosed in the 11th embodiment, an imagecapturing unit 100 g, an image capturing unit 100 h, an image capturingunit 100 i, an image capturing unit 100 j, an image capturing unit 100k, an image capturing unit 100 m, an image capturing unit 100 n, animage capturing unit 100 p, a flash module 401, a focus assist module,an image signal processor, a display module and an image softwareprocessor (not shown). The image capturing units 100, 100 g, 100 h, 100i, 100 j, 100 k, 100 m, 100 n and 100 p are disposed on the same side ofthe electronic device 400, while the display module is disposed on theopposite side of the electronic device 400. Furthermore, each of theimage capturing units 100 g, 100 h, 100 i, 100 j, 100 k, 100 m, 100 nand 100 p can include the optical imaging system of the presentdisclosure and can have a configuration similar to that of the imagecapturing unit 100, and the details in this regard will not be providedagain.

The image capturing unit 100 is a wide-angle image capturing unit, theimage capturing unit 100 g is a telephoto image capturing unit, theimage capturing unit 100 h is a telephoto image capturing unit, theimage capturing unit 100 i is a wide-angle image capturing unit, theimage capturing unit 100 j is an ultra-wide-angle image capturing unit,the image capturing unit 100 k is an ultra-wide-angle image capturingunit, the image capturing unit 100 m is a telephoto image capturingunit, the image capturing unit 100 n is a telephoto image capturingunit, and the image capturing unit 100 p is a ToF image capturing unit.In this embodiment, the image capturing units 100, 100 g, 100 h, 100 i,100 j, 100 k, 100 m and 100 n have different fields of view, such thatthe electronic device 400 can have various magnification ratios so as tomeet the requirement of optical zoom functionality. Moreover, each ofthe image capturing units 100 g and 100 h can be a telephoto imagecapturing unit having a light-folding element configuration. Moreover,the light-folding element configuration of each of the image capturingunit 100 g and 100 h can be similar to, for example, one of thestructures shown in FIG. 28 to FIG. 30 , which can be referred toforegoing descriptions corresponding to FIG. 28 to FIG. 30 , and thedetails in this regard will not be provided again. In addition, theimage capturing unit 100 p can determine depth information of the imagedobject. In this embodiment, the electronic device 400 includes multipleimage capturing units 100, 100 g, 100 h, 100 i, 100 j, 100 k, 100 m, 100n and 100 p, but the present disclosure is not limited to the number andarrangement of image capturing units. When a user captures images of anobject, the light rays converge in the image capturing unit 100, 100 g,100 h, 100 i, 100 j, 100 k, 100 m, 100 n or 100 p to generate images,and the flash module 401 is activated for light supplement. Further, thesubsequent processes are performed in a manner similar to theabovementioned embodiments, and the details in this regard will not beprovided again.

The smartphone in this embodiment is only exemplary for showing theimage capturing unit of the present disclosure installed in anelectronic device, and the present disclosure is not limited thereto.The image capturing unit can be optionally applied to optical systemswith a movable focus. Furthermore, the optical imaging system of theimage capturing unit features good capability in aberration correctionsand high image quality, and can be applied to 3D (three-dimensional)image capturing applications, in products such as digital cameras,mobile devices, digital tablets, smart televisions, network surveillancedevices, dashboard cameras, vehicle backup cameras, multi-cameradevices, image recognition systems, motion sensing input devices,wearable devices and other electronic imaging devices.

The foregoing description, for the purpose of explanation, has beendescribed with reference to specific embodiments. It is to be noted thatTABLES 1-20 show different data of the different embodiments; however,the data of the different embodiments are obtained from experiments. Theembodiments were chosen and described in order to best explain theprinciples of the disclosure and its practical applications, to therebyenable others skilled in the art to best utilize the disclosure andvarious embodiments with various modifications as are suited to theparticular use contemplated. The embodiments depicted above and theappended drawings are exemplary and are not intended to be exhaustive orto limit the scope of the present disclosure to the precise formsdisclosed. Many modifications and variations are possible in view of theabove teachings.

What is claimed is:
 1. An optical imaging system comprising seven lenselements, the seven lens elements being, in order from an object side toan image side along an optical path, a first lens element, a second lenselement, a third lens element, a fourth lens element, a fifth lenselement, a sixth lens element and a seventh lens element, and each ofthe seven lens elements having an object-side surface facing toward theobject side and an image-side surface facing toward the image side;wherein the image-side surface of the sixth lens element is concave in aparaxial region thereof, the seventh lens element has negativerefractive power, the object-side surface of the seventh lens element isconcave in a paraxial region thereof, and at least one of theobject-side surface and the image-side surface of at least one lenselement of the optical imaging system has at least one inflection pointin an off-axis region thereof; wherein a maximum image height of theoptical imaging system is ImgH, an axial distance between the image-sidesurface of the seventh lens element and an image surface is BL, a focallength of the optical imaging system is f, a curvature radius of theobject-side surface of the seventh lens element is R13, a curvatureradius of the image-side surface of the seventh lens element is R14, andthe following conditions are satisfied:7.50<ImgH/BL; and−5.0<f/R13+f/R14<−2.8.
 2. The optical imaging system of claim 1, whereinthe maximum image height of the optical imaging system is ImgH, theaxial distance between the image-side surface of the seventh lenselement and the image surface is BL, and the following condition issatisfied:8.50<ImgH/BL.
 3. The optical imaging system of claim 1, wherein thefocal length of the optical imaging system is f, the curvature radius ofthe object-side surface of the seventh lens element is R13, thecurvature radius of the image-side surface of the seventh lens elementis R14, and the following condition is satisfied:−4.5<f/R13+f/R14<−3.0.
 4. The optical imaging system of claim 1, whereinan Abbe number of the first lens element is V1, an Abbe number of thesecond lens element is V2, an Abbe number of the third lens element isV3, an Abbe number of the fourth lens element is V4, an Abbe number ofthe fifth lens element is V5, and the following condition is satisfied:1.4<(V1+V3)/(V2+V4+V5)<4.0.
 5. The optical imaging system of claim 1,wherein an axial distance between the sixth lens element and the seventhlens element is T67, the axial distance between the image-side surfaceof the seventh lens element and the image surface is BL, and thefollowing condition is satisfied:1.9<T67/BL.
 6. The optical imaging system of claim 1, wherein acurvature radius of the image-side surface of the sixth lens element isR12, the curvature radius of the object-side surface of the seventh lenselement is R13, and the following condition is satisfied:1.5<(R12−R13)/(R12+R13)<3.0.
 7. The optical imaging system of claim 1,wherein an angle between an optical axis and a chief ray at a maximumfield of view emerging from the image-side surface of the seventh lenselement is Ang72c, and the following condition is satisfied:40.0 degrees<|Ang72c|<55.0 degrees.
 8. The optical imaging system ofclaim 1, wherein the first lens element has positive refractive power;wherein a maximum effective radius of the object-side surface of thefirst lens element is Y11, a maximum effective radius of the image-sidesurface of the fourth lens element is Y42, a maximum effective radius ofthe image-side surface of the seventh lens element is Y72, and thefollowing conditions are satisfied:0.65<Y11/Y42<1.5; and2.0<Y72/Y11<5.0.
 9. The optical imaging system of claim 1, wherein afocal length of the sixth lens element is f6, a curvature radius of theobject-side surface of the sixth lens element is R11, a curvature radiusof the image-side surface of the sixth lens element is R12, and thefollowing condition is satisfied:3.0<|f6|/R11+|f6|/R12; wherein a vertical distance between a convexcritical point on the image-side surface of the sixth lens element andan optical axis is Yc62, a maximum effective radius of the image-sidesurface of the sixth lens element is Y62, and the image-side surface ofthe sixth lens element has at least one convex critical point in anoff-axis region thereof satisfying the following condition:0.20<Yc62/Y62<0.50.
 10. The optical imaging system of claim 1, whereinat least one of the object-side surface and the image-side surface ofeach of at least two lens elements of the optical imaging system has atleast one inflection point in an off-axis region thereof; wherein thefocal length of the optical imaging system is f, a focal length of thesecond lens element is f2, a focal length of the third lens element isf3, a focal length of the fourth lens element is f4, a focal length ofthe fifth lens element is f5, and the following condition is satisfied:|f/f2|+|f/f3|+|f/f4|+|f/f5|<1.8.
 11. An image capturing unit,comprising: the optical imaging system of claim 1; and an image sensordisposed on the image surface of the optical imaging system.
 12. Anelectronic device, comprising: the image capturing unit of claim
 11. 13.An optical imaging system comprising seven lens elements, the seven lenselements being, in order from an object side to an image side along anoptical path, a first lens element, a second lens element, a third lenselement, a fourth lens element, a fifth lens element, a sixth lenselement and a seventh lens element, and each of the seven lens elementshaving an object-side surface facing toward the object side and animage-side surface facing toward the image side; wherein the image-sidesurface of the first lens element is concave in a paraxial regionthereof, the image-side surface of the sixth lens element is concave ina paraxial region thereof, the seventh lens element has negativerefractive power, the object-side surface of the seventh lens element isconcave in a paraxial region thereof, the image-side surface of theseventh lens element is convex in a paraxial region thereof, and atleast one of the object-side surface and the image-side surface of atleast one lens element of the optical imaging system has at least oneinflection point in an off-axis region thereof; wherein a maximum imageheight of the optical imaging system is ImgH, an axial distance betweenthe image-side surface of the seventh lens element and an image surfaceis BL, a curvature radius of the image-side surface of the seventh lenselement is R14, a focal length of the optical imaging system is f, andthe following conditions are satisfied:7.50<ImgH/BL; and−10<R14/f<−0.70.
 14. The optical imaging system of claim 13, wherein themaximum image height of the optical imaging system is ImgH, the axialdistance between the image-side surface of the seventh lens element andthe image surface is BL, and the following condition is satisfied:8.50<ImgH/BL.
 15. The optical imaging system of claim 13, wherein thecurvature radius of the image-side surface of the seventh lens elementis R14, the focal length of the optical imaging system is f, and thefollowing condition is satisfied:−7.5<R14/f<−0.90.
 16. The optical imaging system of claim 13, wherein anAbbe number of the first lens element is V1, an Abbe number of thesecond lens element is V2, an Abbe number of the third lens element isV3, and the following condition is satisfied:5.0<(V1+V3)/V2<12.
 17. The optical imaging system of claim 13, wherein acentral thickness of the third lens element is CT3, an axial distancebetween the second lens element and the third lens element is T23, andthe following condition is satisfied:1.0<CT3/T23<2.7.
 18. The optical imaging system of claim 13, furthercomprising at least one light permeable element disposed between theseventh lens element and the image surface, wherein the maximum imageheight of the optical imaging system is ImgH, a maximum value amongrefractive indices of the at least one light permeable element in anoptically effective area is NEmax, the axial distance between theimage-side surface of the seventh lens element and the image surface isBL, and the following condition is satisfied:14.0<ImgH×NEmax/BL.
 19. The optical imaging system of claim 13, whereinthe first lens element has positive refractive power, the object-sidesurface of the first lens element is convex in a paraxial regionthereof, and the image-side surface of the second lens element isconcave in a paraxial region thereof; wherein the focal length of theoptical imaging system is f, a focal length of the first lens element isf1, a curvature radius of the image-side surface of the second lenselement is R4, a central thickness of the first lens element is CT1, andthe following conditions are satisfied:0.20<f/R4<1.4; and6.5<f1/CT1<15.
 20. The optical imaging system of claim 13, wherein anf-number of the optical imaging system is Fno, half of a maximum fieldof view of the optical imaging system is HFOV, and the followingconditions are satisfied:1.2<Fno<2.0; and35.0 degrees<HFOV<65.0 degrees; wherein a vertical distance between aconvex critical point on the object-side surface of the seventh lenselement and an optical axis is Yc71, a maximum effective radius of theobject-side surface of the seventh lens element is Y71, and theobject-side surface of the seventh lens element has at least one convexcritical point in an off-axis region thereof satisfying the followingcondition:0.80<Yc71/Y71<0.97.
 21. An optical imaging system comprising seven lenselements, the seven lens elements being, in order from an object side toan image side along an optical path, a first lens element, a second lenselement, a third lens element, a fourth lens element, a fifth lenselement, a sixth lens element and a seventh lens element, and each ofthe seven lens elements having an object-side surface facing toward theobject side and an image-side surface facing toward the image side;wherein the image-side surface of the first lens element is concave in aparaxial region thereof, the object-side surface of the sixth lenselement is convex in a paraxial region thereof, the seventh lens elementhas negative refractive power, the object-side surface of the seventhlens element is concave in a paraxial region thereof, the image-sidesurface of the seventh lens element is convex in a paraxial regionthereof, and at least one of the object-side surface and the image-sidesurface of at least one lens element of the optical imaging system hasat least one inflection point in an off-axis region thereof; wherein amaximum image height of the optical imaging system is ImgH, an axialdistance between the image-side surface of the seventh lens element andan image surface is BL, a curvature radius of the image-side surface ofthe seventh lens element is R14, a focal length of the seventh lenselement is f7, and the following conditions are satisfied:7.50<ImgH/BL; and0.75<R14/f7<9.5.
 22. The optical imaging system of claim 21, wherein themaximum image height of the optical imaging system is ImgH, the axialdistance between the image-side surface of the seventh lens element andthe image surface is BL, and the following condition is satisfied:8.50<ImgH/BL.
 23. The optical imaging system of claim 21, wherein thecurvature radius of the image-side surface of the seventh lens elementis R14, the focal length of the seventh lens element is f7, an anglebetween a plane perpendicular to an optical axis and a tangent plane tothe image-side surface of the seventh lens element at a periphery of anoptically effective area is Ang72s, and the following conditions aresatisfied:1.0<R14/f7<8.5; and|Ang72s|<20.0 degrees.
 24. The optical imaging system of claim 21,wherein a central thickness of the fifth lens element is CT5, a centralthickness of the sixth lens element is CT6, an axial distance betweenthe fifth lens element and the sixth lens element is T56, and thefollowing condition is satisfied:0.75<(CT5+CT6)/T56<2.4.
 25. The optical imaging system of claim 21,wherein an axial distance between the object-side surface of the firstlens element and the image-side surface of the seventh lens element isTD, the axial distance between the image-side surface of the seventhlens element and the image surface is BL, an axial distance between theobject-side surface of the first lens element and the image surface isTL, the maximum image height of the optical imaging system is ImgH, andthe following conditions are satisfied:9.5<TD/BL; and0.40<TL/ImgH<1.6.
 26. The optical imaging system of claim 21, wherein afocal length of the optical imaging system is f, a composite focallength of the second lens element, the third lens element and the fourthlens element is f234, and the following condition is satisfied:4.5<|f234/f|.
 27. The optical imaging system of claim 21, wherein thefirst lens element has positive refractive power, and the object-sidesurface of the first lens element is convex in a paraxial regionthereof; wherein a curvature radius of the object-side surface of thefirst lens element is R1, a curvature radius of the image-side surfaceof the first lens element is R2, and the following condition issatisfied:−4.0<(R1+R2)/(R1−R2)<−1.0.
 28. The optical imaging system of claim 21,wherein the sixth lens element has positive refractive power; Wherein avertical distance between a concave critical point on the object-sidesurface of the sixth lens element and an optical axis is Yc61, a maximumeffective radius of the object-side surface of the sixth lens element isY61, and the object-side surface of the sixth lens element has at leastone concave critical point in an off-axis region thereof satisfying thefollowing condition:0.20<Yc61/Y61<0.55.